There are few games out there that really deliver in their short playtime. UsTwo Games’ Monument Valley is one such game, offering surreal architecture puzzles that must be navigated for the sake of Ida, a silent princes of sorts. If you haven’t tried the first game, then take note – it’s currently free for Android via the Google Play Store.

The basic premise of Monument Valley involves moving Ida from one odd geometrical marvel to another, as optical illusions and environmental tricks are laid bare. Ida is going through a kind of journey and is dealing with the mysterious Crow People in the process.

Along with the base game, there’s Ida’s Dream and Forgotten Shores, the latter offering an additional eight chapters for an additional purchase. If you like the game enough, then it’s worth checking out Monument Valley 2. The sequel sees a mother, Ro, moving through the same kind of impossible architectures with her daughter, seeking to explore the valley’s mysteries.