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Are you a bad enough dude to
One of the more well-known turn-based JRPG games that was only released in Japan, though it does have an English fan translation.
Jump to Scenario 01 Start Event 01 Press A if you want to look at event Press B if you don't want to look at event Press Y to only look at map
At offset 0xFFAD in a headerless ROM, change the first two values from FF 00 to 00 FF (or enter Pro Action Replay (PAR) codes C0FFAD00, C0FFAEFF). This will enable a debug menu, accessible by holding L + R on controller 2 and resetting the game.
First the scenario select menu (left screenshot) will appear. After selecting a scenario, the debug menu (right screenshot) will appear.
In the debug menu, press A to start the chosen scenario as normal, B for a battle test, and Y for a world map debug screen.