what is the meaning of the second + in the save file?

in the "Load a Game" menu it tells you how many puzzles you solved in this format:
("normal" puzzles ) SOLVED, +(environmental puzzles) +(the number in question); ...
so what does this second + with the number refer to?

1 Answer

According to this IGN article, the second number is the number of solved puzzles that do not involve panels.

Here's the number that a 100% game file should have, as far as current players are aware of:

523 +135 +6

The first number represents puzzles solved, the second number represents environmental puzzles completed, and the third number represents obelisks completed by finding all the associated environmental puzzles.