The game
Steer the snake, eat apples, grow. Hit a wall or yourself and it ends. Every apple makes you longer and slightly faster, so the game gets harder in two directions at once.
Swipe on a phone, arrow keys on a desktop, or use the on-screen pad. Reversing straight into yourself is blocked, because that would be an instant loss to a mis-swipe rather than to a mistake.
Why it gets hard, precisely
Not because of speed. Because of space. A long snake turns the board into a maze that you built and have to keep navigating. The failure mode is almost never "too fast to react" — it is having sealed off a region and only noticing three moves later.
So the skill is not reflexes. It is not creating dead ends, which is a planning problem disguised as an arcade game.
How good players actually play
- Hug the edges. Keeping your body along the boundary leaves the interior open. Coiling in the middle carves the board into pieces.
- Follow your own tail. The cell your tail is about to vacate is always safe. Serious play is essentially maintaining a loop you can ride indefinitely while detouring for apples.
- Take the long route to the apple. The direct path is usually the one that traps you. Approach so that you exit into open space, not into a pocket.
- Look at where your tail is, not just your head. Most deaths are collisions with a body segment the player had stopped tracking.
- Turn early. At higher speeds a turn decided late arrives one cell too far.
A note on the theory
Snake is a genuinely interesting computational object. Playing perfectly — filling the board completely — is possible on an even-sided grid by following a Hamiltonian cycle, a route that visits every cell exactly once. Just riding that cycle guarantees a win, and is also extremely slow, which is why good human play is a compromise between following it and taking shortcuts.
Deciding the optimal shortcut set is, in the general case, computationally hard. Which is a satisfying thing to know about a game that looks this simple.
Frequently asked
Q. Can you actually fill the board?
A. In principle yes, in practice almost never — the speed increase makes the endgame
brutal long before the board fills.
Q. Why can I not reverse direction?
A. Because reversing into your own neck is an instant loss with no decision in it. Every
version of Snake blocks this.
Q. Does the apple ever appear somewhere impossible?
A. It never spawns on your body, but it can spawn in a region you have already sealed
off. That is a consequence of your own routing, not bad luck.
For a planning puzzle where randomness is the obstacle instead of your own body, try number merge.