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If one uses too many codes at once, the probability of freezing rises. If one encounters freezing, it is recommended to disable recently-added codes before starting the game up again. Having less codes enabled decreases the likelihood of improperly set flags and coding, thus decreasing chances of freezing. When the user turns the game back on, the trigger which prepares the execution of the code may not cause the game to freeze, and if successful, the user will be able to resume play. If the user has used an Action Replay and wishes to play their game without the use of codes or to fix problems and glitches caused by the codes, they can restart their game file.
Incorrect codes may also cause Bad Eggs to appear in the games
....3DS systems lock out Action Replay DSi.
Several examples of Action Replay codes include walk through walls, [[event]] codes, and [[Shiny Pokémon]] codes.