Each player has an identical set of tiles, arranged with B's on top and E's on bottom. Of the 4 A tiles, choose a castle and another tile for your hand; the others (from all players) form a random starting play area.
On your turn, you place 1, 2 or 3 tiles, immediately drawing a replacement after each placement. These are played one at a time, and must be orthogonally adjacent to what's already on the board. They may not extend beyond the play area (7x7, 9x9, or 10x10 for 2er, 3er, or 4er). If a placed tile has a castle, you bring 0-5 knights (discs) into play onto that castle. Then, you may move those knights in a straight line, placing a number of knights on each tile entered (including the castle) based on terrain: plains=1, forest=2, mountains=3 (lakes impassable). Max total of 4 knights/tile at end of movement; if you can't enter a hex (e.g., forest with 3 knights present), you may not move beyond it. May not skip any tiles. If other player knights are present, place yours in a stack on top.
The game ends when everyone has played all their tiles. Earn VP based on tiles controlled (knight on top of stack controls tile): castle=1VP, village=2VP, town=3VP. Most VP wins! Tie-breaker = most unused knights.