Being a big fan of the series, I've decided to attack the first GBA game.
For those who don't know, this game is a very solid 2d platformer with a simple movement set. The focus of the games is on puzzles rather than dexterity, though the stages EX-1 and EX-3 rely on superior acrobatics.
Comments welcome!
Technical Stuff
ROM Klonoa - Empire of Dreams (U).gba
WIP v19
Improvement Finished 2-1, 408(!) frames ahead
Tricks
Long Jumps Some jumps which the designers probably did not intend are possible with frame-by-frame precision.
Quickfalling One frame of hovering applies maximum downwards velocity, at the cost of a few pixels of horizontal movement.
Spawn Manipulation Portals take a number of frames to produce another enemy once you have destroyed the first one it provides. If the portal is still on screen (or very nearby) when the enemy is destroyed, it immediately starts to spawn another. This can be manipulated to provide enemies earlier or later.
Ladder Exits Exits which are reached by climbing can be triggered earlier than usual by holding a sideways direction.
Brick Grabbing Bricks are not meant to be grabbed through low ceilings (that you can't carry them under), but it is quite possible with frame advance or just lots of tries, unassisted.
Embedding If you throw a brick and are still inside it when it begins to drop (after hitting a wall), you can still move around, occupying the same space as it. You are unable to shoot the wind ring but can still jump out. There are also some doors that let you stay inside them when they close, and still exit both ways.
Damage Boosting Firing a wind bullet and turning just before you hit a moo sends you flying in the opposite direction slightly faster than if you had just walked it. It also pushes you upwards a little, useful for extra high jumps. Exact frame gain depends on the situation.