Stage 1 - Gain all three skill bonuses (destroy all gun carriers until neon signs, then destroy red carrier after signs; destroy all neon signs; destroy only bottom saucer section of mid-boss.) When you reach the boss, do not attack him as normal. Instead, wait for him to move toward you (with the side-scrolling view.) One of his attacks is a gun pod from his back. Once in every 10 or so time, this weapon is the Juno.

Stage 4 - A large boat will pop out of the water. Destroy the body only. The tower will fly off. Dodge and kill this tower before it leaves the screen. It will drop the Juno and give you a skill bonus.

Flash
Similar to the Cannon, can kill any non-boss enemy in fewer than 3 shots.

Stage 3 - After spider mid-boss, destroy the large pylon at the top of the screen, and then destroy every item that falls from it. Use a Juno or Vulcan for greater success. This will award a skill bonus and the Flash.

Stage 5 - Take apart the mid-boss piece by piece before killing him. This earns the Flash and a skill bonus.

Mosquito
Similar to the Wasp, fires missles which are guided by the control pad. A little stronger than the Wasp's missles.

Stage 4 - At the small maze-like section, move as quickly as possible down the tunnels, and pick up the Spreader on the way. Switch the Spreader to your top slot. A couple of floors straight down will be an enemy and a set of barrels directly behind you. Destroy the barrels to obtain the Mosquito.

Python
Powerful mines, similar to Hedgehog. Very hard to use.

Stage 5 - Destroy large vehicle in the background of the first part of the stage. Must use Wasp.