You can actually edit all the missions, including the training ones !
All you have to do is to open the *.wma files in your \Data\Missions in WordPad and tada ! you can edit all that you want.
For example, edit the round time at the training missions so now I can get Gold Medal for free !!! (you also have to edit the option EndGameWhenTurnEnds or something like that)
Hidden Option Requirements
To reveal the hidden options, you must complete a set task; one for each option. To activate a hidden option once it has been revealed, go to the Weapons options screen or the Game options screen and click on the star.
Laser sight: Complete mission 4
Jetpack: Complete mission 8
Fast walk: Complete mission 13
Invisibility (only works in net games):
Complete mission 16
Low gravity: Complete mission 20
Super Banana Bomb upgrade:
Complete mission 33
Aqua Sheep upgrade: Get Gold on
super sheep racing training
Longbow upgrade: Get Gold on
Shotgun upgrade: Get Gold on Rifle
Grenade upgrade: Get Gold on
Blood: Get Gold on Basic Training
Sheep mode: Get Gold on Crazy
Invincible worms: Get Elite ranking
Indestructible landscape: Complete
GAME SET UPS
To get the "Full Wormage" game setup, you must get a Gold medal (and in the case of Deathmatch mode) and Elite ranking in everything!
Complete the following missions to unlock these cheat options:
Mission 4 = laser
Mission 8 = jetpack
Mission 13 = fast walk
Mission 16 = invisibility in net games
Mission 20 = low gravity
Mission 25 = indestructible landscape
Mission 33 = Super Banana Bomb power up