How to play
- Choose a horizontal position for the next numbered piece.
- Drop it so equal values can collide and merge.
- Create chain reactions while keeping the pile below the limit.
What this game practices
Makes repeated doubling easy to see and adds estimation through physics. Random piece order means it is not a controlled arithmetic exercise.
How we checked it
Open-source HTML5 game reviewed in the local coolmath build for startup, primary controls, restart flow, narrow-screen fit, console errors, failed requests, and third-party network activity. Upstream telemetry is disabled in this self-hosted copy.
Open-source license and attribution
This self-hosted game is adapted from Web Games by mashukui and distributed under the MIT License. coolmath disabled upstream telemetry and records its local changes in the open-source notices.
Reviewed by coolmath Editorial Team · Updated 2026-10-09