Confirm which count you are reading
Use the current in-game campaign total. Your browser tracker is an independent checklist, so 104 checked website records does not prove that the game has recorded 104 solves. A community reply reports that the campaign total may refresh after taking a few ordinary steps; that is a report to check, not a guaranteed fix.
Compare areas before individual solutions
The community coordinate checklist includes single-solve cells at (−1,0) and (2,1). Revisit an unchecked area before guessing at a room. Its coordinate convention is independent of the source recreation map; matching numbers from different maps does not identify the same cell.
Use visual clues for the last search
Once an area is narrowed down, note the heroes, mirror count, visible monsters, goal arrangement and unusual geometry. The Missing Puzzle Finder suggests areas to recheck. The Puzzle Finder can then compare recorded room features. Neither tool reads your save or claims to know your exact missing puzzle.
If the room is not yet verified
Keep a note or submit a source reference through Corrections. Pending registry slots retain their URLs and stay out of search indexing until their layouts and solutions are checked. Do not mark a guessed working ID merely to make the website counter reach 105.