Record of Lodoss War -Deedlit in Wonder Labyrinth-

Steam has a great guide for the game including this 100% map.

https://steamcommunity.com/sharedfiles/filedetails/?id=22364...

Most of the secret rooms in this game are very obvious compared to other games of this type, as they are mostly behind very noticeably cracked walls.
There are no holes in the middle of the map, any empty areas that are not on the outside edge of the map are secret areas, only 3 secret rooms are on the outside edge of the map, all on the west end:
-SW of the top teleporter room in the blue map area.
-2 Squares north of that same teleporter, in the purple area.
-NW of that purple area secret room, also in the purple area.

There are two secret rooms not behind cracked walls:
-4 Squares above the lowest teleporter room on the map, in the blue zone. You can get in here by jumping from below, your hud makes it so you cant see theres a way in.
-Theres a pesky hidden room in the red area you start the game in with a long vertical room above and below it, and rooms with green locked doors on either side of it. To get into this room you need to go above it and jump on the floor until it starts shaking, then eventually breaks.