| 4x4 Problems | 31 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1178 | 21 | |
| 4x4 Problems | 30 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1165 | 6 | |
| 4x4 Problems | 29 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1160 | 15 | |
| 4x4 Problems | 28 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1150 | 28 | |
| 4x4 Problems | 27 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 1 | 1134 | 13 | |
| 4x4 Problems | 26 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1138 | 5 | |
| 4x4 Problems | 25 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1134 | 5 | |
| 4x4 Problems | 24 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1129 | 11 | |
| 4x4 Problems | 23 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1121 | 34 | |
| 4x4 Problems | 22 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1103 | 9 | |
| 4x4 Problems | 21 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 1 | 1095 | 10 | |
| 4x4 Problems | 20 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1102 | 92 | |
| 4x4 Problems | 19 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1078 | 16 | |
| 4x4 Problems | 18 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1066 | 21 | |
| 4x4 Problems | 17 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1049 | 8 | |
| 4x4 Problems | 16 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1041 | 6 | |
| 4x4 Problems | 15 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1034 | 5 | |
| 4x4 Problems | 14 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1028 | 5 | |
| 4x4 Problems | 13 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1023 | 5 | |
| 4x4 Problems | 12 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1017 | 9 | |
| 4x4 Problems | 11 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1007 | 5 | |
| 4x4 Problems | 10 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 1000 | 15 | |
| 4x4 Problems | 9 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 986 | 5 | |
| 4x4 Problems | 8 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 979 | 5 | |
| 4x4 Problems | 7 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 971 | 11 | |
| 4x4 Problems | 6 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 959 | 16 | |
| 4x4 Problems | 5 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 942 | 5 | |
| 4x4 Problems | 4 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 935 | 5 | |
| 4x4 Problems | 3 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 927 | 5 | |
| 4x4 Problems | 2 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 920 | 7 | |
| 4x4 Problems | 1 - - Solved You got it right. It gives no more XP and becomes available for Review after one week. | ✓ | 0 | 909 | 5 | |
