I have yet to collect 24 badges, to be listed below, in order of difficulty.
EASY:
None.
MEDIUM:
Army of Destruction.
HARD:
Rings Pass Not
Speck Oppression
Asteroids Revenge III – Crash to Survive
Papa’s Pizzeria
Papa’s Pizzeria
Thing-Thing Arena 2
Treasure of Cutlass Reef
LightSprites
Smileys-War
Starfighter: Disputed Galaxy
Thing-Thing 4
Amberial: Nebulosa Realms
Ragdoll Invaders
Arachnophilia
Wooden Path
IMPOSSIBLE:
Desktop Tower Defense 1.5
Max Mesiria Chp2 RPG
Dolphin Olympics 2
Hexiom
Super Crazy Guitar Maniac Deluxe 2
Zunderfury
Tarnation
Super Crazy Guitar Maniac Deluxe 3
 "Darkruler2008")