Push a single domino and every piece in its path shoves forward together, plan the chain reaction.
Move every domino onto its ghosted target square using as few pushes as possible. Each level is guaranteed solvable.
Sokoban's rules are the constraint every crate puzzle inherits: boxes can only be pushed, never pulled, and a box shoved into a corner is a deadlock you cannot undo.
The original mechanic is the push-the-whole-train move — a shove propagates down a line of dominoes rather than moving one.
Sokoban's difficulty comes from irreversibility, and a train amplifies it in both directions. One push can place three pieces correctly or bury all three, so the move count the level asks for is usually a clue about how many trains it expects you to find.
Domino Dynasty is an original sliding-block puzzle built around a push-the-whole-train mechanic. Free to play in your browser on PlayPendium.