By completing Character Unlock Missions, players can unlock new Legendary Duelists to play as. However AT&T allowed iPhone owners who have satisfied contract requirements to unlock their iPhone. It can also unlock computers without the use of a password. By completing some of these achievements, players can unlock Xbox achievements. George Hotz developed the first iPhone unlock. Find the key, unlock the history. Some vehicles automatically adjust settings based on the smart key used to unlock the car. The player may also unlock cheats by completing levels within a certain time limit. The game features a skill tree that allows players to unlock and upgrade their skills. With this, users can unlock the tablet with their phone's fingerprint sensor. However, certain games may unlock single-player cheats if the player fulfills a certain condition. Players may also unlock hidden vehicles by completing certain in-game tasks. Also, most providers will unlock the phone on demand. The game uses a skill tree system that allows the player to unlock new abilities. If the player completes the minigames, they unlock a secret ending.