Cache TTL Game
Could be played by 3 or more players, plus a moderator. Each player holds a "cache" of key/value pairs, each with a TTL expressed in number of moves (not time), and a certain capacity (typically around a dozen entries). On every move, the moderator states a new key/value pair to be placed in "cache", together with its TTL. Every now and then, the moderator requests the "value" of a particular "key". People with matching values stay in the game, others are out for the round. When 2 people are left they list the contents of their "caches" and the moderator performs a full verification. The player with fewer errors wins. Note: different flavors of the game are configured with different cache eviction policies. ‎- Valera Fooksman