A js13kGames 2017 game (theme: lost): pilot a submarine to nine ocean research stations and stabilise each core by repeating its code message.

A daily deduction puzzle: ping cells of a grid to learn the distance to the nearest hidden reflector, then mark where all the reflectors must be.

A daily direction-finding puzzle: two or three hidden sound sources sit around a 16-point compass, and you rotate and listen to triangulate where they are.