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Documentation Index

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Snake Classic Game has no manual difficulty setting. Difficulty increases automatically as your score grows — the higher your score, the faster the snake moves. Speed is governed by the tick interval: the number of milliseconds the game waits between each update cycle. A shorter tick means the snake moves more often per second, leaving you less time to react and plan.

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Level formula

Your current level is derived directly from your score: 
level = Math.floor(score / STEP_SCORE) + 1
With STEP_SCORE = 5, a level-up occurs every 5 points. Level 1 starts the moment a new attempt begins (score = 0) and there is no upper cap on levels — the speed cap is reached at level 8, but the level counter continues climbing.
ScoreLevel
0–41
5–92
10–143
15–194
20–245
25–296
30–347

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Speed formula

The tick interval for a given score is calculated as: 
tick = Math.max(MIN_TICK, BASE_TICK - (level - 1) * STEP_MS)
With the actual constants from source:
  • BASE_TICK = 130 ms — starting interval at level 1
  • MIN_TICK = 45 ms — absolute floor; the game never moves faster than this
  • STEP_MS = 12 ms — interval reduction per level-up
function getTick(score) {
  const lvl = Math.floor(score / 5) + 1;
  return Math.max(45, 130 - (lvl - 1) * 12);
}
Each level subtracts 12 ms from the interval until the 45 ms floor is hit. From that point on, extra levels no longer change the speed.

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Speed table

LevelTick (ms)Cells/sec
11307.7
21188.5
31069.4
49410.6
58212.2
67014.3
75817.2
84621.7
8+45 (cap)22.2
Cells/second is calculated as 1000 / tick. The value shown for level 8+ (45 ms cap) represents the maximum attainable speed of approximately 22.2 cells per second.

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Level-up notification

Every time the snake eats enough food to cross a level boundary, three things happen simultaneously:
  1. HUD colour flash — the level indicator (LVL: N) in the HUD briefly turns orange for 400 ms, then returns to its normal yellow colour.
  2. Flash message — the status area below the canvas displays LVL N — ¡MÁS RÁPIDO! for 900 ms before clearing automatically.
  3. Screen-reader announcement — announceAlert() fires an assertive aria-live announcement so assistive technology users receive the same level-up notification: “Nivel N. ¡La velocidad ha aumentado!”
Level 6 and above (tick ≤ 70 ms) is considered expert speed. The absolute minimum tick of 45 ms is reached at level 8.

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How speed affects strategy

At low levels (1–3) the snake moves slowly enough that you can react turn-by-turn. As levels climb past 5, the window between one move and the next shrinks below 100 ms — faster than a typical human reaction time for a fully deliberate keypress. At the 45 ms cap you have less than a twentieth of a second per cell. Effective high-level play requires planning routes several steps ahead rather than reacting to each frame. Memorising safe looping paths, avoiding dead-end corridors, and keeping the snake’s body distributed evenly across the grid all become essential habits once the speed exceeds level 5.

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