Firework Sync — free browser game

Firework Sync is an original timing game built on a single mental subtraction. Each round shows a 'Target' time at the top (for example 5.0 s) and 3-5 fuses on the stage, each labelled with its burn time (e.g. 1.4 s / 2.7 s / 3.3 s). When the round starts, the clock at the bottom counts up from zero. Your job is to light each fuse at a moment such that when it finishes burning — its rocket detonates — the clock shows exactly the Target. In practice, you compute one number per fuse: light_time = Target − burn_time. To light a fuse, click it, tap it, or press its number key (1-5). A lit fuse visibly shrinks; when it reaches zero, a colourful burst appears at the top and a small dot marks its explosion moment on the timeline. The round ends when all fuses have detonated, then each explosion is compared against the Target. If a fuse's deviation is within tolerance (starts at ±0.30 s, tightens slightly each round), it counts as 'clean'; up to twice tolerance is 'okay'; further is a 'miss'. All clean means you win the round and score +1; a single miss costs one life. After three lives the run ends and your best round count is saved. Unlit fuses also count as a miss and the round times out at Target + 1.5 s. Tip: spot the longest burn-time fuse first, since you must light it earliest — you can be late before the clock even reads 1. Train the Target-minus-burn-time subtraction as a reflex, don't fixate on tiny fractions — one decimal is enough — and don't panic; the tolerance is forgiving.