Hello, 'Unkillable Cat'
1. You need the Mine Key to enter 'Olde Scorched Valley'. It is on the small island in the south-west of the Main Beach.
2. Eternal Catacombs - Kill the Medusa to spawn the bridge.
3. Eternal Catacombs - Go to the south-east to the room where the skeleton archer was. Kill it and press the buttons on the left and right side. They open new areas.
4. Greater Grimwern Woodlands - Go through the 'Living Forest' and get the Ornate Key, then use it on the lock in the Healing Crystal area.
5. ..."blocked by grass". I'm not sure what you're referring to.
6. Excavation SIte - Solve to two northern puzzles then return to the site entrance. Take the long way around and the mine door spear will be open. There you can reach the southern part.
7. Eastern Zhaoze - The blue floor tiles are a simple puzzle.
* The typos irritate me. I hate errors but, It's hard to find them all.
* The ability to walk through the wall in Grimwern Woodlands is indeed an error.
Explore more. Stop worrying about the particulars and look around. "Open-world exploration. Players are rewarded for searching and exploring, whilst challenged when they discover new areas."
That quote is taken from the description. This isn't Legend of Grimrock 2, it is a modification. This mod delivers a different experience, so adapt; search, and explore.