Many video games have measures built in to punish the player for cheating (whether by builtin cheat codes or external cheating/hacking devices). These countermeasures can vary from simple messages and reminders that constantly remind (and hopefully embarrass) the player about not playing by the game's intended rules, to more serious measures like denying access to certain features (bonus content, achievements, etc.) while cheats are in effect. In extreme cases, the game can permanently 'brand' the player's save file with some kind of designation to indicate the use of cheat codes (some games can erase their save file outright).