From Sokoban Wiki

Summary of the Original Extra level set

Each solver is tested separately to ensure that they don't compete for system resources.

Though some people might be interested in how long it takes to solve a given level and/or how good the solution is (optimal or not),
this summary disregards all timing associated with solving the levels and solution statistics.

These tests are mainly for gauging solvability, not timing nor how good the solution is.

All solvers combined solved 40 of 40 levels.

Solver Statistics      Set: Original Extra
Level No.	BoxSearch	Takaken	YASS	JSoko	Sokolution	Solved by only one	Solved by all	Solved by none
1							yes
2
3							yes
4							yes
5							yes
6							yes
7
8							yes
9							yes
10							yes
11
12							yes
13							yes
14							yes
15							yes
16						yes
17							yes
18							yes
19						yes
20							yes
Level No.	BoxSearch	Takaken	YASS	JSoko	Sokolution	Solved by only one	Solved by all	Solved by none
21						yes
22
23
24
25
26
27
28							yes
29							yes
30							yes
31							yes
32							yes
33							yes
34							yes
35
36							yes
37
38
39
40						yes
Total	23	38	36	32	34	4	23	0