Website and data research by 101Leafy.
Boulder
岩
Trap
Pixie's hint
Grim Reaper's Cavern, Floor 7
The path is blocked by boulders.
You can push the boulders, but you can't pull them.
Move the boulders carefully
or you can't go through.
Temple of Nightmare, Floor 10
This is the Warp Tile. You can warp somewhere.
If you warp, the boulders will reset themselves.
Use it when you get into trouble, ok?
Dragon's Belly, Floor 19
There's a weapon here called Double Lasers.
They face each other
and a beam shoots out in between them.
To destroy it, approach from the side.
If you try to attack from behind, you'll get hit.
You can block the beam with a boulder too!
Move the boulders around carefully!
Dragon's Belly, Floor 22
Watch out for Luminous Lex!
He moves around and shoots at you
and he can't be destroyed.
Either dodge the beam or use a boulder to block it.
Dragon's Belly, Floor 24
FireBreathers! They spit out flames and get in your way!
They're really strong so you can't defeat them!
Either dodge the flames or block them with a boulder
From the manuals and magazines
An obstacle in the passage. It does not attack. You can move it by pushing.
Ryuusei Yarou's one-point advice
Of all the traps, the one to watch is the boulder. Enemy attacks, shots, and beams cannot pass a boulder, so use it well and it will block enemy attacks.
If you see this large pebble blocking the path, simply push it out of the way. It also makes a superb cover from bad guys.
Official art

