The game was built in the Unity game engine, which enabled faster prototyping across multiple smartphone platforms.[7][8] It was also designed first to fit on the iPhone's smaller screen—a lesson learned from Hitman Go, which had been designed for tablets.[8] The Square Enix team collaborated with Tomb Raider brand owners Crystal Dynamics to fit the series license. The player-character outfits, in particular, were informed by this exchange.[7]