Sandbox 03

Move X to Y

How to play: slide highlighted tiles on X until it matches the fixed configuration Y. Choose an ε class, try the challenge yourself, or animate a shortest solution from your current position.

X

Movable configuration

0moves18steps left
Y

Fixed target

Reference
Choose an orbit

Shared ε value

ε(X) = ε(Y)+1Therefore X and Y lie in the same 15-puzzle orbit.

Configuration X is ready. Match it to configuration Y.