Mosaic of the Strange pairs a supernatural murder investigation with a catalogue of paranormal cases. FBI Special Agents Cullen and Brady lead the story, while completed puzzle regions reveal files inspired by real-world events, strange creatures, unsolved murders and mysterious deaths. The subject matter ranges from cryptids and alien encounters to hauntings and psychic phenomena, giving the investigation a wider eerie backdrop.
Its central activity is solving large, interlocking mosaic puzzles with Minesweeper-like clues. Each numbered clue indicates how many light tiles belong within one square of it, so progress depends on interpreting nearby clues and filling in the image correctly. The puzzle solving is interwoven with point-and-click story elements, character dialogue and case-file discoveries rather than presented as an isolated logic challenge. An original soundtrack draws on classic crime thrillers of the 1990s.
The store lists Mosaic of the Strange as single-player, making its format a focused solo mix of deduction and narrative investigation. Adjustable difficulty, a mouse-only option and the ability to play without timed input are also listed, alongside partial controller support.