A programming puzzle game where you never steer. Wire blocks into a graph, give your snake sensors, memory, and a processor — then press play and watch it run exactly what you wrote. 100 levels, from two blocks to blind counting in the dark.
You never steer.
There are no arrow keys. Your snake stands still until the program you built tells it to move — and then it does exactly what you wrote, including the part you got wrong.
Tail Recursion is a programming puzzle game. You solve a level by wiring blocks into a graph: sense the world, branch on what you find, count, remember, act. Then you press play and watch your logic run one tick at a time.
Build the program, not the path
Drag blocks onto the canvas and wire them together. Move Forward, Turn Left, Repeat N Times, If / Else, Wall Ahead?, Store, Recall. Every block spends from a per-tick budget, so a clever program beats a long one — and the score agrees.
Read the world
Wall ahead? Food ahead? Door ahead? Sensors are the only way your program learns anything. Two blocks and one sensor will walk any perimeter forever — the trick is knowing which two.
Your body is your hardware
Sensor Segments let you see.
Memory Segments give you variables.
Processor Segments raise your budget.
They are body segments. Capability costs length, and length is what kills you.
Watch it think
The graph lights up as it runs — which block fired, what the sensors returned, what it cost, what the snake did. When it dies, the game says which death it was: you hit a wall, or you hit yourself. Those need completely different fixes.
106 levels
Six tutorials that teach the language, then 100 puzzles that stop teaching. Corridors, spirals, combs, keyed vaults, gated floors — and runs with no sensors at all, where you must count the whole route in the dark before you walk it.
Score, then beat your score
Every level carries a budget set by its difficulty. Slow runs spend it. Extra action blocks spend it. Loops, conditions and sensors are free — they are how you save it. Apples always pay for the detour that fetched them. Replay any level to raise your total.
And
Free Play — an endless board and a combo score
Custom levels — drop .level files into a folder and they appear in the menu
Moddable — blocks are Lua, and they hot-reload while the game is running
Official site
On Steam
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