Dere Quest is the first “bonus game” created by Yanna Curtis in DERE EVIL.EXE. It is clearly inspired by old pixel RPGs like Dragon Quest. The game features a top-down view of Knightly walking across a pleasant grassland surrounded by trees to the north and water and mountains to the south. Knightly’s actions in Dere Quest are limited to walking and minimal interaction with a couple of NPCs. Along this brief journey, Knightly sees a blue-robed NPC watching over a few pets hanging out on the shore, a stoic knight, and a ruler figure with a large red gem. At the end of the grassy lane is a small house surrounded by four red gems. However, Yanna’s corruption creatures ambush Knightly before he can reach the house, and the game ends, leading to the second bonus game, Derenoid.

An unreleased sequel, Dere Quest 2, exists, but can only be found or accessed with a certain URL that can be discovered after a player clears all the bricks in Derenoid.