Okay, I honestly have no idea what I'm doing. I've trigger the last boss, but I still have some things to get in the Top Rightish parts of the map.
The only way I can see getting there is through the Purple Zone, right now I'm in the area that has the High Explosive sign to the right, and a little watery part that leads to a Fan you need to disable for a Foam upgrade.
Above me is the only part on the map I can see that joins, but it's got a cover that only a grenade can destroy, and since I'm underneath it, I can't blow it up, unless there's some way to stick grenades on things?
Can someone please help me? Many people on here say it's entirely possible to get to the top right aftet triggering the final boss, but I'm just not seeing it.