Stage One: Jungle Boogie
You are dropped by parachute into a hot mess of ferns and palm trees filled to the brim with spear and shield wielding gremlin buggers. Atop the waterfall, the boss awaits: A giant stone gremlin face that shoots lasers out of its eyes and spits gremlin spear throwers.
Stage Two: Cave-in
Entering the mouth of the giant face, you find yourself in a quasi-auto scroller in which there's a instant death cave in steadily advancing behind you. Jumping over lava pits and lava waterfalls, you avoid the now bomb chucking gremlins until you arrive at a large lava lake, from which rises a gremlin riding a magma dragon. Avoid its molten breath and the lava stones the gremlin throws until you pump enough hot lead into its face that is skeletonizes, falling and forming a bridge to the next area.
Stage Three: Ice Ice Gremlin
Slip and slide your way through a frozen wasteland complete with bullshit instant death ice spikes and slippery platforms. The gremlins are now wearing snow mufflers and throwing snowballs that don't deal damage but instead knock you around and stun. Inexplicably, there are also giant yetis. However, upon killing one it is revealed they are merely robots being piloted by more gremlins. The boss is a giant skeleton/robot snowman being piloted by a gaggle of frantic gremlins throwing snowballs at you in an attempt to knock you into the spikes.
Stage Four: Skychase
As a last act of defiance the robot skeleton snowman gremlin throws you skyhigh before exploding. Luckily, you happened to land on a passing Pegacorn, and now you must mash B as fast as possible to shoot down all the gremlins using hang gliders flying in odd patterns. The boss is a robot Pterodactyl. Avoid his sonic screech attack! You may think staying under him is safe, but that will trigger his Chaos Dive.
Stage Five: The Search for a Cure
Your Pegacorn was injured in the boss fight and needs your help! Brave the lost sunken city of Atlantis to find Evercrystal, the one thing that can save his life. Beware, however, the Gremlins have also found this lost ruin and also seek the Evercrystal to power their ultimate invention: A Bomb! The Ancient Guardian who failed to stop his city from dying awakens to redeem himself at the end of the stage. He is quickly mind-controlled by the Gremlins and you must avoid his sword and plasma attacks while shooting off the legion of Gremlins that cling to his command circuit.
Stage Six: Meanwhile...
While the hero returns with the Evercrystal given to him by the now freed Guardian to heal his Pegacorn, the President has escaped his ropes and now seeks to avoid capture again. Your basic forced stealth section as you avoid enemy gremlin patrols inside their gigantic mecha-base. No boss.
Stage Seven: Escape!
Making his way to a balcony overlooking a shattered wasteland, the President despairs. Suddenly, the hero (riding his Pegacorn) swoops in! The President jumps on and the chase is on! Similar to stage four except this time you must also be sure to not let the President fall off the Pegacorn. A second player can join in co-op style here to control the President as he throws bills at your enemies. Beware, however, as the boss is the robot skeleton snowman now riding the Pterodactyl.
Stage Eight: Revenge
Though you defeated both Pterodactyl and Robot Skeleton Snowman, the President has been recaptured. You must now break into their Mecha-base and slaughter them all. Your Pegacorn provides support by launching artillery strikes from outside. This level is extremely long but eventually you find yourself at the central command module in the heart of the Gremlins base. Laughing manically, the President reveals himself to be a Gremlin and steals the Evercrystal from you, powering the Bomb! You have three minutes to defeat Super-Gremlin and disarm the weapon.
Final Boss (Hard Mode Only)
If you're playing on Normal, Easy, or Romo mode, the game simply rolls credits and challenges you to retry with more vigor. However, should you be playing on Nightmare, your Pegacorn will save you at the last minute as the bomb explodes. Flying through the exploding base and avoiding debris is the least of your problems: The Super-Gremlin has survived and has harnessed the power of the Evercrystal to become Ultra-Gremlin. However, the Evercrystal fractured into three parts due to the darkness in the Super-Gremlin's heart, and the power of Courage and Lasers are absorbed into you and your Pegacorn. Use these new powers to destroy the Ultra-Gremlin once and for all. Beware, I'm using a lot of evil fire for this boss.
That about does it.