Logic puzzles with a single correct answer and enough information to reach it without guessing. Some are famous, some are ours. 2048 still does what it always did, sliding tiles until equal numbers merge. Bridges asks you to connect numbered islands so each one carries exactly its number of spans and the whole network stays connected. Conduit is a rotation puzzle where you spin tiles until a glowing core reaches every endpoint at once. Several have a daily board shared by everyone, so your solve time is comparable to other people's rather than only your own.