| 37. Sudoku Solver | | | Solve | Hard | | |
| 85. Maximal Rectangle | | | Solve | Hard | | |
| 174. Dungeon Game | | | Solve | Hard | | |
| 212. Word Search II | | | Solve | Hard | | |
| 296. Best Meeting Point | | | Solve | Hard | | |
| 302. Smallest Rectangle Enclosing Black Pixels | | | Solve | Hard | | |
| 317. Shortest Distance from All Buildings | | | Solve | Hard | | |
| 329. Longest Increasing Path in a Matrix | | | Solve | Hard | | |
| 363. Max Sum of Rectangle No Larger Than K | | | Solve | Hard | | |
| 407. Trapping Rain Water II | | | Solve | Hard | | |
| 499. The Maze III | | | Solve | Hard | | |
| 568. Maximum Vacation Days | | | Solve | Hard | | |
| 631. Design Excel Sum Formula | | | Solve | Hard | | |
| 675. Cut Off Trees for Golf Event | | | Solve | Hard | | |
| 741. Cherry Pickup | | | Solve | Hard | | |
| 749. Contain Virus | | | Solve | Hard | | |
| 773. Sliding Puzzle | | | Solve | Hard | | |
| 778. Swim in Rising Water | | | Solve | Hard | | |
| 782. Transform to Chessboard | | | Solve | Hard | | |
| 803. Bricks Falling When Hit | | | Solve | Hard | | |
| 827. Making A Large Island | | | Solve | Hard | | |
| 864. Shortest Path to Get All Keys | | | Solve | Hard | | |
| 980. Unique Paths III | | | Solve | Hard | | |
| 1074. Number of Submatrices That Sum to Target | | | Solve | Hard | | |
| 1210. Minimum Moves to Reach Target with Rotations | | | Solve | Hard | | |
| 1263. Minimum Moves to Move a Box to Their Target Location | | | Solve | Hard | | |
| 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix | | | Solve | Hard | | |
| 1289. Minimum Falling Path Sum II | | | Solve | Hard | | |
| 1293. Shortest Path in a Grid with Obstacles Elimination | | | Solve | Hard | | |
| 1301. Number of Paths with Max Score | | | Solve | Hard | | |
| 1349. Maximum Students Taking Exam | | | Solve | Hard | | |
| 1368. Minimum Cost to Make at Least One Valid Path in a Grid | | | Solve | Hard | | |
| 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows | | | Solve | Hard | | |
| 1444. Number of Ways of Cutting a Pizza | | | Solve | Hard | | |
| 1463. Cherry Pickup II | | | Solve | Hard | | |
| 1568. Minimum Number of Days to Disconnect Island | | | Solve | Hard | | |
| 1591. Strange Printer II | | | Solve | Hard | | |
| 1595. Minimum Cost to Connect Two Groups of Points | | | Solve | Hard | | |
| 1632. Rank Transform of a Matrix | | | Solve | Hard | | |
| 1728. Cat and Mouse II | | | Solve | Hard | | |
| 1970. Last Day Where You Can Still Cross | | | Solve | Hard | | |
| 2088. Count Fertile Pyramids in a Land | | | Solve | Hard | | |
| 2123. Minimum Operations to Remove Adjacent Ones in Matrix | | | Solve | Hard | | |
| 2132. Stamping the Grid | | | Solve | Hard | | |
| 2258. Escape the Spreading Fire | | | Solve | Hard | | |
| 2267. Check if There Is a Valid Parentheses String Path | | | Solve | Hard | | |
| 2290. Minimum Obstacle Removal to Reach Corner | | | Solve | Hard | | |
| 2328. Number of Increasing Paths in a Grid | | | Solve | Hard | | |
| 2371. Minimize Maximum Value in a Grid | | | Solve | Hard | | |
| 2392. Build a Matrix With Conditions | | | Solve | Hard | | |
