Number Lab vs Reactive Cube

Embark on a mathematical journey where numbers cascade down columns. Merge the bottom numbers with a satisfying click, adding them to create a new sum. Watch as your strategic choices unlock paths and guide the merged numbers to the right boxes below. Challenge yourself with varying levels of complexity and become the ultimate Number Merge master!

Reactive Cube is a minimalist 3x3 puzzle cube simulator for iPhone. Twist faces with a tap, drag to rotate the cube in 3D, and solve at your own pace. FEATURES • Smooth 3D cube with intuitive drag-to-rotate • All standard face turns (U, D, F, B, L, R) and middle slices (M, E, S) • Scramble, undo, and move counter • Standard mode — classic fixed colors • Dynamic mode — colors that react as you twist • Dark interface, designed for focus • No ads, no accounts, no tracking Whether you're learning to solve, practicing speed, or just unwinding with a tactile puzzle, Reactive Cube keeps it simple and clean.