In late 2021, Tower of Hell saw several updates that attempted to patch common exploits. Consequently, "October 2021" was used by script developers to signal that their specific version was against the latest game security measures at that time.
Allows you to jump continuously in mid-air, effectively letting you "fly" to the top of the tower.
Prevents your character from taking damage or dying when hitting "killparts" (the red glowing obstacles).
Scripts from this era often included specific code to circumvent the game's built-in detection systems. Context for October 2021
While these tools promised easy wins, using them often led to permanent bans from the game, as Tower of Hell uses recording systems to review suspicious completions. THE Tower of Hell (Legacy)
These exploits were designed to give players unfair advantages to reach the top of the tower without effort: