These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adaptation Displacement: The Storm Impact version was an adaptation of a 1993 black-and-white Macintosh video game, which was itself an adaptation of a very obscure Tabletop Game. The 1993 game and the tabletop game are long since forgotten.
Breather Level: Once you navigate Fierce Fold, Dripstone (the 7th task) is quite easy due to its small size.
Game Breaker: Using the "restart place" spell, you can reset a dungeon repeatedly to get multiple copies of rare items (such as the Poison Potion, Potion o' Plenty, or Z's Power Up, which greatly increase all stats). Enough "restart place"s around one of the power-up potions can easily cap your status bars.
Ethereal potions can also be a game breaker, as they allow the player to pass through most walls and skip straight to the goal. The programmers acknowledged the ethereal potion cheat in Poet's Nightmare, by adding a staircase hidden behind a wall that leads straight to the goal.
One version of the game accidentally left in a spell that was supposed to be used only for debugging and beta-testing purposes. The spell allowed the player to wish for any object, and could be used as often as the player wanted. Using the spell in subsequent versions force-quits the game.
Moral Event Horizon: The TaskMaker's last task, when he asks you to kill a prisoner who turns out to have a good alignment. As if to drive the point home, he also rewards the player with "DRUGS!!" before assigning the task, which will send the player to Hell if used.
That One Level: Poet's Nightmare and Vidair's Tower. Poet's Nightmare involves a lot of going around in circles, while Vidair's Tower involves going through the right pattern of teleports and doors (broken if you're lucky with a Teleport scroll).
Unwinnable by Insanity: The game can become this if you bestow a task item to an NPC and then kill them — quite often, it won't be on their person when they die. However, 1.) bestowing is optional in the first place, 2.) there are plenty of far better objects that can be bestowed, and 3.) using "restart place" will make the task item respawn in its original place.