Ability to change weapons when...
	Various Trophies...

Just beat hard mode (with or without continues) to unlock the capacity to use select any weapon at anytime using L and R. Hard mode itself is unlocked by beating normal mode. Careful though : the weapons still have limited ammo and when out, you will have to cycle through the arsenal again to find the weapon you were using. To prevent that, tap L and then R (or vice versa) to reload the ammo.

Complete the following tasks to unlock PlayStation 3 trophy rewards.

Trophy	How to unlock
1 Credit Hard Mode (Gold)	Clear game in Hard Mode using 1 credit.
1 Credit Normal Mode (Silver)	Clear game in Normal Mode using 1 credit.
Adventurer (Bronze)	Destroy secret passage from stage 2 (Normal Mode).
Avoid them all! (Bronze)	Finish any level without firing (except for the boss) with 1 credit.
Column breaker (Bronze)	Destroy all columns in Stage 2 (Normal Mode).
Finish Normal Mode (Bronze)	Clear game in Normal Mode.
Hamster Master (Bronze)	Go through Stage 5-2 (Normal Mode) without losing any HP.
Hardcore spitter (Bronze)	Finish any level using spit weapon only.
Kill that ram! (Bronze)	Kill jumping ram from stage 1 (Normal Mode).
Kill that robot! (Bronze)	Kill jetpack robot from stage 3 (Normal Mode).
Millionaire score (Bronze)	Score 1.000.000 points.
Screen clear using a berry #2 (Bronze)	Kill all bats using a berry on the wall in Stage 2.
Screen clear using a berry (Bronze)	Kill hen and all crows in Stage 1.
Top score (Bronze)	Reach first position in the local Hi-score table.
Welcome to Flying Hamster! (Bronze)	Finish Stage 1 (Normal Mode).