A sliding puzzle, sliding block puzzle, or sliding tile puzzle are varieties of tour puzzle that challenges a player to slide around blocked pieces along certain routes (usually on a board) to establish a certain end-configuration.

The pieces to be moved may consist of simple shapes, or they may be imprinted with colors, patterns, sections of a larger picture (like a jigsaw puzzle), numbers, or letters.

They are frequently in 3 x 3 x 3 configurations often with images and a popular puzzle that is played online by people of all ages.