What's your least favourite level(s)?

[pegwin1234]

Arid Canyon 2 and the Castle Eggman boss. I play on mobile so of course i would hate them for obvious reasons.

 

[Mystic Mania]

Aerial Garden

just found out losing 1 (one) life resets every single switch in the stage teehee rthat's so cool

 

[Mr Beagle]

just found out losing 1 (one) life resets every single switch in the stage teehee rthat's so cool

That is actually the default behavior of the SRB2 engine (where every linedef executor resets unless you execute logic to activate them on reset manually).

You can use SOC to have the map be a persistent environment so it does not do this, but you lose the title card showing up on every retry.