Armored Core 4 [BLUS30027]

Here you go, I played through a few missions with no problems barring the textures still being wack. In all of my tests I never had the problem of falling through the floor. Hopefully this helps you.

:Edit: Almost forgot to add that the audio issue only really happens when you're messing around with your mech parts and it kinda just resolves itself over time if you play a bit.