Gameplay

The goal of each of the 49 levels is to unite Ilo and Milo, who must work together to meet. Players can change control between Ilo and Milo, or two players can take turns (one controls Ilo while the other controls Milo). Levels are made up of various cubes, some of which Ilo or Milo can pick up and carry in order to place elsewhere in the level, opening a path for the other to travel on. Different cubes have different effects; one kind extends across gaps, another allows Ilo or Milo to fall through and end up on the other side, and another rises like an elevator. There are also carpets which allow characters to walk on different sides of the cubes and switches which activate bridges. Hidden throughout the levels are various fragments, which when collected piece together postcard memories, explaining some of the game's backstory. There also small creatures called Safkas hidden in each level, which unlock bonuses when collected.