I REALLY like Snake Duel... SO I decided to make this handy little guide so that you can reach for the stars and declare yourself Snake Duel Champion! 
Introduction
Godfinger on Sixth Street
Snake Duel is an arcade game located at Godfinger on Sixth Street and is open 24/7! As of this time, there are two games available to play, both of which can be played either multiplayer OR single-player.
But Snake Duel is our specific game of choice this morning, singe-player mode for some extra heart-pounding gameplay! While the multiplayer mode only goes for 120 seconds (or 2 minutes) at a time and allows respawns, single player gives you ONE chance to get as many points as possible!
Single Player Snake Duel
At the time of writing this, I am in the Top 0% of all single-player Snake Duel players! Whether this is because no one else really plays this mode beyond the introduction to Godfinger, or if it's because I'm just a sweaty snake grinder remains to be seen... BUT with this guide, maybe someone out there will give me a run for my money and show me who's the real Snake Duel boss!
I don't even have the 30mil achievement yet...
Controls
WASD
The basic way to move your Snake! I'm sure you're familiar with movement keys, as ZZZ uses the same ones for moving your Agents (on desktop, anyway)! But, for clarity's sake: The W-key moves your snake up, the A-key moves left, the S-key moves down, and the D-key moves right!
(Note: you can ALSO use the arrow keys if preferred!)
ESC
Pauses gameplay and asks the player, "Are you sure you want to quit?". Click 'cancel' to return to Snake Duel, or click 'confirm' to quit! (Note: the game does not save your progress when you quit, so you'll have to start over if you click confirm!).
You can effectively pause at any time with no disadvantage, and the gameplay resumes immediately upon clicking 'cancel' or pressing ESC again. Don't be afraid to use this when you get overwhelmed, but make sure you remember what your Snake was doing when you come back!
J or Z
Your 'boost' button! This speeds you up and helps your Snake to be more aggressive whether it's for attacking enemy Snakes, or quickly scooping up Beans! You can use your boost infinitely.
Terminology
Take this as a quick dictionary of terms I use throughout this guide that otherwise weren't defined!
Beans
The yellow polygon shapes that pop up. Each one increases your snake size by 1 when consumed. The first Bean you grab is worth 1000 base* points, and this amount increases by 100 for each subsequent Bean you grab! (Example, 1st Bean, 1000 points; 2nd = 1100, 3rd = 1200, etc.!)
* See Point Calculation section for more information.
Whenever you grab the last Bean on screen, another will spawn ~1 second after! You'll never be left hungry.
Diamonds
This white/blue diamond shape floats across the map and offers more base points, 10,000 to be exact. They also increase your snake length by 5!
Duel
This is when you go head-to-head with an enemy snake. If you collide with a snake, each of snake will lose 1 length at a time until you either turn OR run out of blocks. Whoever has the most blocks wins (usually), but be careful!
Dueling offers more points than killing a snake another way, dependent both on how many blocks are taken away and how many Beans you've consumed at that time! Each block of the enemy snake that you consume = +1000 base points for you!
You can bail out of a Duel by turning in a different direction, but make sure you react quickly! Or it'll result in a Game Over before you know it.
The result of Dueling...
Zoning
This refers to deliberately pushing a Snake to a certain space on the board, whether it's to keep them out of the way or to force them to kill themselves. Both the player and enemy Snakes are capable of doing this! It's simply moving your Snake in a way where the enemy has no choice but to move them the way you like. This is the best way to kill faster Snakes such as Red and Black.
Zoning Pink against the wall!
Point Calculation
If I'm totally wrong about this I apologize! It's hard to tell what points are coming from where in the heat of gameplay, but to the best of my knowledge, this information is correct!
In my observation, points are calculated entirely based on the length of your Snake.
Your base score (*mentioned above under Beans and Diamonds, and Duel) is based on the starting length of 5 blocks of your Snake. However, the number of points you earn do go down if your Snake has less than 5 blocks! With this in mind, you can calculate that each block of Snake length that you have at the time of acquiring points (whether it's from killing Snakes, grabbing Beans, etc.) is equal to a 200-point multiplier.
If you're interested, you can do some hypothetical point math knowing this information! For example, if you have a snake with a length of 20, and run into a Bean, you can now easily calculate that you'll earn 4,000 points from that one Bean! This also proves that kills don't matter as much as Beans do, but both are good to strive for to rack up the best score possible.
As for Diamonds, note that because they increase your Snake length by 5, they thus increase your base score 5x as much as one Bean!
However, because this is a bit difficult to calculate during gameplay, I'll go with a base stat for point calculation. In other words, each point calculation from beyond this point is based only on a Snake with a length of 5 and no other multipliers.
PHEW... 
ENOUGH MATH.
Point Sources
You can receive points from a plethora of sources, so doing calculations on all of them is a bit impossible. However, the following is a running list of where you can get points!
- Picking up Beans/Diamonds
- Picking up Power-Ups
- Dueling (Note: Enemy Snakes that Duel each other will each grant you, the player Snake, points! Surprise!)
- Enemy Snakes dying for any reason, whether or not you cause the kill
You don't get extra points for killing a super long enemy Snake, BUT they'll sometimes drop more than enough Beans to make up for it! You also don't get any points for destroying Obstacles (see below!)
Power-Ups and Obstacles
Rainbow Bomb, Speed-Boost, and Invincibility Block power ups!
Power-Ups
There are only three types of power-ups available in this game that I've so far encountered! Each one can help you in massive ways to survive longer. I have no idea if there are in-game names for them, so I've named each of them myself!
Enemy Snakes can NOT pick up Power-Ups of any kind!
Speed-Boost
(+10,000 points when used)
Just grabbed a quick boost!
This green square is the first power-up that you'll encounter of every game. It speeds you up (as if you're pressing J) without the need of any additional input. Do note, however, that you can't stop the speed boost manually, and have to continue with it until time runs out. This can hamper you in later levels when your Snake has gotten so long that you have to pre-plan your turns.
On the other hand, it's really handy! You can double-speed boost by pressing J even when this power-up is activated, allowing you to easily circle around enemy Snakes that otherwise might be too quick for you to trick!
Invincibility Block
(+10,000 points when used)
Rainbow Snake after using Invincibility Block!
This square is a 4x4 rainbow block that pops up in later levels. When passing over it in any of its corners, your Snake will then start shining rainbow and be completely invincible to any damage as well as gain a free Speed-Boost. This includes running into yourself, running into other snakes, running into the wall, hitting Spike Balls, and hitting the Grey Walls that pop up randomly!
If you run into a wall you will continue to lose Length until you move a different direction, or until your Length runs out (resulting in a Game Over). If you run into yourself without moving, you'll simply lose Length until you can continue going forward.
When you begin flashing, that means the time is almost up! I recommend stopping immediately so that you don't crash into an object you were about to destroy. Trust me, it ends VERY quickly!
Here's a tip! Save it for as long as possible until a really difficult snake pops up! I save it for my arch-nemesis, the Yellow Snake!
Rainbow Bomb
(+10,000 points when used)
This bomb floats over the map instead of staying in one spot like the Invincibility Block. When your snake passes over it at any point, it instantly blows up and destroys every obstacle and enemy on the board at that time!
On the downside, it also destroys any Beans that were on the field that had not yet been picked up by yourself or enemy Snakes. But the Snakes that were destroyed by the bomb still drop whatever Beans they would if you had killed them otherwise! So, a small price to pay for victory in the long-run!
The result of using a Rainbow Bomb!
Obstacles
Obstacles, similar to Power-Ups, are small in number!
Grey Wall
This little grey 1x1 block pops up as an obstacle randomly during the course of the game! Although it's small, it can be a nuisance during later Phases when every square on the map matters. It's very common that there can be 3-5 on your board at a time and will endlessly continue to spawn. It will not instantly kill Snakes on contact, but more than 1 second of hesitation upon impact will cause the game to end and your Snake to die.
Can be destroyed with Invincibility or a Rainbow Bomb.
Spike Ball
These balls take up about 4 squares of space on the board, and will instantly kill any Snake that comes into contact with it! In early phases, it is entirely stationary so it's easy to avoid, and can even be used when zoning enemy Snakes if an outer wall is too far to reach! Like the Grey Wall, it will continuously spawn, but poses a bigger threat because of its larger size.
Note however that this trap will eventually begin to float across the map in later phases, similar to the Diamonds.
Can be destroyed with Invincibility or a Rainbow Bomb.
Speed Trap
Super Rare?!
This rare and elusive block showed up at around 25,000,000 points, I think? It's a 1x1 just like the Speed-Boost, but this one significantly slows you down!
I recommend not using it unless there aren't so many enemy snakes on the board, or if you simple need to chill out and plan your turns better!
Phases (Snake Types)
As far as I've gotten in Snake Duel, I've noticed 5 specific types of Snakes, differentiated by their color(s) and pattern of behavior. Each 'difficulty' of gameplay (explained in the next section) features a new kind of snake you'll have to overcome again and again!
Therefore, each new snake type encountered signifies a new level of difficulty (or, in simpler terms: new phase encountered!)
Purple
(+5,000 points per kill)
Starting Length: 3 Blocks
Quick Tip: This Phase is the time to focus on lengthening your Snake and 'bulking' up.
What you'll see the first few seconds of Snake Duel.
Starting at Phase Purple, the first enemy Snake encountered! This one is the slowest and 'dumbest' in terms of AI (as in, how fast a snake can response/adapt/act intelligently compared to the player snake's chosen moves). This Snake seems to be focused more on collecting Beans rather than attacking the player Snake.
This makes it simple to counter: just grab the Beans first! If you approach the Bean first, most Purples will quickly turn away and back off. Half of the time, they will end up colliding with you, an enemy Snake, or the wall before they pose a real threat. They have quite a slow reaction speed, so if you quickly turn into them, most of the time they'll collide.
The negative: Although Purples are simple, they are prevalent throughout the entire gameplay and spawn continuously, even as you enter different phases. They can eat up your Beans quickly when you aren't paying attention or are forced to play defensively, so make sure you choose a priority (killing other snakes vs. collecting Beans) or else you'll get overrun and be stuck at a short length!
Also, just 'cause they're more passive doesn't mean they won't kill you! Playing recklessly with any of the Snakes will end in a Game Over!
Final note: killing all Snakes on the screen will immediately spawn another Purple.
Pink
(+20,000 points per kill)
Starting Length: 12 Blocks
Quick Tip: Don't let them get too long and eat all your Beans. They aren't as conflict-avoidant as Purples, and might make you run into them!
Pink has spawned!
Spawns after ~30 seconds of gameplay. Smarter than Purples, this Snake is focused on stealing Beans from the player but won't hesitate to try to snipe! They're slightly slower than the player Snake, but faster than Purples by a lot! Unlike Purples, if you try to run into them headfirst for a Duel, they're more likely to veer off at the last second and kill you.
Pinks will also try to directly attack you if there are little-to-no Beans on the board, so be careful!
> Spike Balls or Grey Walls are most likely to begin appearing around this Phase! <
Red
(+50,000 points per kill)
Starting Length: ~24 Blocks
Quick Tip: Push them to an edge of the board until there's a 1x1 space. Then, when they enter that area, cut them off so they have no choice but to collide!
Red is aggressive and in-your-face!
Focused on killing the player, when they spawn they'll immediately beeline right on over to you! They're faster than the player noticeably, but not in an overwhelming way. These Snakes are highly aggressive to all Snakes on the board, but prioritize kills over their own safety! Trap them in corners while they're trying to kill you, and you can easily force them into a wall or your own body and stop them in their tracks!
With a Speed-Boost, you're faster than this Snake! I recommend boosting them into a corner and then go slow the rest of the way!
> Your first Invincibility Block is most likely to appear between Red Phase and Yellow Phase! <
Yellow
(+100,000 points per kill)
Starting Length: ~2-3 Blocks
Quick Tip: Save Power-Ups (especially Invincibility Block or Rainbow Bomb) from Red Phase until the first Yellow spawns!
Save your Power-Up for Yellow!
This Snake type seems to ignore Beans most of the time in favor of 'zoning' the player Snake and going for the attack! They spawn with a short length, and move very very quickly.
Pay attention to them but DON'T focus them unless: 1, there are no other enemy Snakes, or 2, there are multiple Yellows on board. I've seen Yellows get taken out by even Pinks multiple times if I wait long enough without engaging. They can be annoying but because of their small length, they can be easy to zone off with a longer snake body. But more than one can quickly trap you like a horse in stall! Stay vigilant!
Try to destroy them with Power-Ups as soon as you can! (Most of the time, a Power-Up will spawn about 10-20 seconds before Yellow first appears! Try to save it if you can for this moment.)
With a Speed-Boost, you're faster than this Snake, but only by a bit!
> Your first Rainbow Bomb is most likely to appear during this phase, ~20 seconds before Black spawns! <
Black
(+~100,000 points per kill)*
Starting Length: ~38-40 Blocks
Quick Tip: Save Power-Ups, similar to Yellow. OR, focus on getting a long snake body to keep them on one half of the board while you focus other enemy Snakes. KILL ASAP.
These Snakes are the most aggressive as well as the fastest, even faster than Yellow. They spawn with a MUCH longer length than Yellows, making them much more dangerous, too! They can dodge your attempts to zone or trap them, and can even pull a reverse-card and get you tangled up before you even notice! Focus them with all your might!!!
Despite this, you don't need a super long Snake to defeat this enemy. Use its own length against it and try to get it trapped against a wall or circling within its own body. Don't panic even though it's fast! If you can't zone, try to hold out until a Power-Up spawns, or save one that spawns when Yellow appears on your next run. You got this!!
Black and White coming to ruin my life!
White
(+??? points per kill)*
Starting Length: ??? (Semi-Infinite)
Quick Tip: Circle them as close as possible so they have no choice but to run into themself. Because it can't wait for its own trail to run out, if you zone around this one very tightly it will eventually kill itself with little-to-no effort.
This Snake moves rather slowly, pretty much the same speed as Purples. You can think of this as a 'Snow' snake: It leaves a semi-permanent trail behind wherever it goes, blocking you off. It isn't focused on Beans or killing, but still ultimately hampers your ability to control the board. In the beginning they're simple to ignore, but when more and more aggressive enemies spawn, you'll desperately want that board space back!
* At this point in the game it's difficult for me to calculate the base points for this enemy. Will update if I can ever figure it out!
Final Words
The information in this guide is based on my (pinkiepebbles) own experience, experiments, and playstyle. I have done my best to provide the information as earnestly and correctly as possible nonetheless and apologize if there are any errors!
It's up to you if you want to play aggressively or defensively! Each one has its own merit and your playstyle just depends on what you feel works for you best. Just stay calm and don't be afraid to pause. If you have a lot of enemies on your screen it can get overwhelming, but sometimes they'll take each other out if you're patient enough.
Don't boost a lot! I know it's frustrating when you get a really high-score and die stupidly so you want to rush back to where you were, but constant boosting has made me lose more often than it's saved me!
And just remember it's a game (within a game!) If you decide it's not for you then the only thing you're missing out on are a couple Polychromes you can easily make up by doing dailies, check-ins, or Hollows!
I'd be really happy if anyone had any other tips/tricks/whatever to share about Snake Duel! And don't be scared to show your high-score as well!!
Happy Dueling~
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Edit 7/10/2024: Added the Speed-Trap obstacle!
Edit 7/25/2024: Added 'Z' as a second boost button!
