Oli One Sneak In is a multi-genre indie game developed by Arghirescu Constantin. The game features elements of action, adventure, casual gaming, simulation, and strategy games. The player takes on the role of Oli, a master thief who specializes in sneaking into high-security locations and stealing valuable treasures. The game takes place in a variety of locations, including banks, museums, and other heavily guarded buildings. Each level presents a new challenge, with different obstacles and security measures that the player must overcome to complete their mission.