Rare Replay
200 Achievements
4,000
200-300h
De-Bug Mode
Battletoads: Eat 50 flies over time.
15
0.38%
How to unlock the De-Bug Mode achievement in Rare Replay - Definitive Guide
The quickest way to grab this is to save just before the 4 flies appear in the first level. So after you have defeated the two red flying dragons, jump over the gap and kill the red devil things (might be silver) then save. Eat the as many flies and you can and then re-load your save.
You do not need to exit to the main menu for the flies to count. I have only done that in the below video to show you the percentage Increases. The achievement won't unlock until you quit out to the main menu.
UPDATE: As per the first comment, you can apparently have the achievement unlock in game without quitting to the main menu.
Eat 1-3 flies, MENU, LOAD saved game, repeat. Achievement will pop after 50th.
Eating flies (using or when they are nearby) partially restores Rash's health; this achievement requires you to eat a total of 50 flies, as a cumulative total across all playthroughs of the game. You'll work a long way towards this in the course of a standard full playthrough of the game, but will likely not reach the full 50.
To complete the rest of the required cumulative total, my recommended approach is to start a new game and play through the first stage as normal. You should shortly encounter a group of flies. Make a manual save here, then eat as many of the flies as you can before they leave the screen. Now reload your manual save and repeat as necessary.
Note that you can't use the 'rewind' feature to work towards this.