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Old School

Old School is an achievement obtained by completing every story level from 8-1-1 through 8-4-3 in order on either diffculty without taking damage and without switching difficulty. Its value is set to 1 if at the end of 8-4-3 on either difficulty, the played_campaign_without_deaths value in the progress for Main Story is true. This is in turn only set to true if 8-1-1 is started on either difficulty, and will be set to false if you die, switch characters (but not switching Custom's outfit), restart from the beginning of the level after reaching a checkpoint (except in 8-1-1), play a story level other than the level you are standing on (including changing the difficulty), or use a revival potion on versions 1.4.44 and above without having premium. Playing battle stages on either difficulty and playing levels from other campaigns (excluding those from the other difficulty of Main Story) do not affect played_campaign_without_deaths, so this can be done freely during an Old School attempt. The game does not immediately save when dying or using a revival potion, so exiting the level before respawning after dying or before reaching a checkpoint after using a revival potion without premium (either by pausing and quitting or just by closing the game), then played_campaign_without_deaths will still be true and playing until the end of 8-4-3 will still award Old School.