The third CG is really a tough one. I've only gotten one since the slugs keep attaching to her which results in the slug game over CG.
But I never get tired of this game. I really want to be able to play the full version when it comes out.
---------- Post added at 02:26 PM ---------- Previous post was at 12:56 PM ----------
Okay, I just found out two steps on how to get all the CGs for the third type.
In the second to the last area, there is one platform just above a spitting slug and lots of those spike ball plants. This is an easy way of getting the "bottom-less" CGs. Just stay on the platform just near the edge. Time your jump with each spike ball shot, jumping forwards a little bit. If you time it right, the spike ball will knock you back and kill you, and you'd still be in the said platform, but well in range for the slug to spit at you but he can't reach you with his jump attack.
The boss is also a great way to get the 3rd CG, just go back one map, get your life drained to one by either the slug or the spike ball plant, go back to the boss and try to get hit by the projectiles. It's easier in a way since the projectiles already strip Iris' clothes off and also does damage.
The hardest one to get was actually the first type of the 3rd CG since you need to have all of Iris' clothes intact. I got mine through and accident wherein I jumped over a projectile and landed on top of it. It took Iris' last life, triggered the 3rd CG, but didn't get a piece of clothing off.