Wow, what´s that!? There were just 10 hanjies left to solve, so I started to fill in square by square, and it was still closer and closer to a tree ... and finally on third try I got that "solved" yellow sign. Still cannot believe :)
SPOILER: R in top right corner, T in bottem left, EE (reversed) in bottom right R2/c5,c17 R3/c6,c12,c16 R4/c7,c13,c15 R5/c6-8,c14-15 R6/c9,c14,c18 R7/c9-10,c13-14,c17 R8/c2-3,c6,c10,c12-13,c16,c21 R9/c3-c4,c6,c11-12,c16,c19-20 R10/c1,c5-6,c11,c15,c17-19 R11/c2-3,c6-7,c11,c16,c19 R12/c3-4,c7-8,c11,c15-16,c20 R13/c5-9,c11,c13-15,c18 R14/c4,c9-13,c16-17 R15/c3,c9-10,c14-15 Well, that´s it - hopefully a did make no mistake...
SPOILER: R in top right corner, T in bottem left, EE (reversed) in bottom right
R2/c5,c17
R3/c6,c12,c16
R4/c7,c13,c15
R5/c6-8,c14-15
R6/c9,c14,c18
R7/c9-10,c13-14,c17
R8/c2-3,c6,c10,c12-13,c16,c21
R9/c3-c4,c6,c11-12,c16,c19-20
R10/c1,c5-6,c11,c15,c17-19
R11/c2-3,c6-7,c11,c16,c19
R12/c3-4,c7-8,c11,c15-16,c20
R13/c5-9,c11,c13-15,c18
R14/c4,c9-13,c16-17
R15/c3,c9-10,c14-15
Well, that´s it - hopefully a did make no mistake...
R15/c3,c10-11,c14-15.