In the prison where there are several portals. :)

heelllp! ive tried hit this big ant thing's every part of body, but there is no any damage. How can i hit it?

It's basically impossible to 100% it as you can permanently miss things and even on a new playthrough not know where the missing things are. I'm missing one last weapon and a couple upgrades and I know where two things are that I missed but I have no idea how to even get there... wish there was like a NewGame+ that would show you how many collectibles are in each area before you move on and permanently lose access to them....

I noticed on my X360 controller if you hold down A, he will continuously jump. Any chance you could give us the option to hold down the attack button to continuously attack? :) I got to Treasure Island 1 and the business card. Searched the area where there are a billion rats but its just seems to go in a circle? Where are you supposed to go?...

One can only hope.