In CHAINsomnia, a.k.a. チェインソムニア, sleeping children become trapped in the castle of the demon Akuma and must work with others to escape. If any player is on the "wake up" tile when all "bad dream" cards are removed, they escape and win the game; if all the characters are immobilized by chains or the event cards are exhausted without anyone waking up, then everyone is defeated.
In more detail, you and each other player take a character card and cover two of the six spaces on its "chain gauge". The highest uncovered number on this gauge shows how many action points (AP) you have available on your turn, and each character has a unique skill, in addition to values for strength, wisdom, and luck. All characters start on the central tile, with the "wake up" tile being placed at the bottom of the room tile deck. On a turn, you use your AP to take actions from the following list, repeating actions as desired:
