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| Easy | Medium | Hard | |
| #1 | 0x1p | 1x1p | 2x1p |
| #2 | 0x2p | 1x3p | 2x2p |
| #3 | 0x3p | 1x2p | 2x3p |
| #4 | 0x4p | 1x4p | 2x3p |
| #5 | 0x5p | 1x5p | 2x4p |
| #6 | 0x6p | 1x6p | 2x5p |
| #7 | 0x7p | 1x7p | 2x6p |
| #8 | 0x8p | 1x8p | 2x7p |
| #9 | 0x9p | 1x9p | 2x8p |
| #10 | 0x10p | 1x10p | 2x9p |
| #11 | 0x11p | 1x11p | 2x10p |
| #12 | 0x12p | 1x12p | 2x11p |
| #13 | 0x13p | 1x13p | 2x12p |
| #14 | 0x14p | 1x14p | 2x13p |
| #15 | 0x15p | 1x15p | 2x14p |
| #16 | 0x16p | 1x16p | 2x15p |
| #17 | 0x17p | 1x17p | 2x16p |
| #18 | 0x18p | 1x18p | 2x17p |
| #19 | 0x19p | 1x19p | 2x18p |
| #20 | 0x20p | 1x20p | 2x19p |
| #21 | 2x20p |
