** There are two (abandoned) stone transformers at the high altitude of 13-4; if one dies as a stone ball here, there will be a [[wrong ball]] softlock, and the level can only be restarted.

** 13-5's stone transformer and extra point are behind [[checkpoint]], and the sound set of the last section of the rail is wrong.

* There is a long-standing legend in [[Ballance Bar]] that in a lost version of the Twilight zone, in addition to the 13th level "Speed", there are also the 14th level "Strength" and the 15th level "Ability", but this is merely a myth; there is no evidence of such. But, this also gave birth to the custom series [[Power]] and [[Ability]] "pseudo", and the Ballance Mod produced by [[Ballance Mod Loader Gamepiaynmo/|Gamepiaynmo The Loader plug-in]] directly added the "power" and "ability" selection function.

* The [[DepthTestCube]] at the end of Level 7 is not long enough. If the player deliberately goes off the path near the spaceship and continues to move forward, he will bypass the death zone and keep falling infinitely (causing [[non possum mori]]).