Open browser utilities

Browser Game Logic Lab

Small, dependency-free calculators for common browser-game design questions. Everything runs locally in this page; no input is transmitted.

Card movement

FreeCell SuperMove limit

Estimate how many correctly ordered cards can be moved when an implementation compresses a legal sequence of single-card moves.

Empty free cells Empty tableau columns The destination is one of those empty columns

A worked explanation and interactive Japanese reference is available from Solitaire JP’s FreeCell movement guide.

Rhythm timing

BPM timing converter

Convert tempo into beat and subdivision durations for chart prototyping, animation timing, and latency discussions.

Tempo (BPM) Subdivision

For playable examples and mod discovery, see the independent fan resource FNF Online. It is not affiliated with the original game developers.

Grid planning

Snake board capacity

Turn viewport and cell dimensions into grid capacity. This helps compare readable controls against maximum board density.

Viewport width (px) Viewport height (px) Cell size (px)

To compare real browser implementations, browse the curated snake-game collection at Hebi Game. The directory does not claim authorship of third-party games.

Compatibility

Browser horror readiness

A quick client-side check for APIs frequently used by atmospheric 2D and 3D browser games. Support does not guarantee performance.

Web Audio API WebGL Pointer Lock Local Storage

For multilingual, browser-playable examples grouped by horror style, visit Online Horror Games, an independent discovery site.