Select Play to load the game.
How to play
Tap the left half to subtract and right half to add. A/D or arrow keys also work. Hold to repeat. Space or Escape pauses. Multiplication buttons unlock during play.
Touch and keyboard. Fullscreen starts from your click where the browser supports it. Otherwise, Expand fills the available browser viewport; use Exit expanded view to return. On iPhone/iPad, browser bars may remain visible.
Saves stay on this device and origin. Reloading can restart an unsaved run. This arcade copy has separate browser storage from original hosted versions.