GOAL Reduce your opponent to fewer than four stones by enclosing their stones to form a Hades, removing them from the game.

SETUP Stones are automatically placed in the starting layout. White moves first, then players alternate.

1 — RUN Move a stone forward in a straight line to an unoccupied field. The stone cannot pass through or share a field with other stones.

2 — PUSH Take the place of an adjacent stone, pushing it one field forward. A pushed stone cannot push back on the very next turn.

HADES A Hades forms when one or more enemy stones are completely surrounded horizontally and vertically with no adjacent empty fields. All enclosed stones are immediately removed. Hades can occur during normal movement or during a Tilt. After a Hades occurs, stones do not slide further that turn.

TILTING If a stone ends its move on a direction field, the board tilts that way — all stones slide toward that field until blocked by another stone or the edge. Stones enclosed during the slide form a Hades. If a stone lands on another direction field during the slide, the board tilts again.
The tilt is in effect as long as direction fields are occupied, and occurs after every movement.
Two opposite direction fields active simultaneously: no tilt.
Two adjacent direction fields active: the active player decides which tilt triggers first.

WINNING The game ends immediately when a player is reduced to fewer than 4 stones. The opponent wins.