| 1. Put a ring on it. | BasicsData Structures Google | Easy 1 | 57% 511 / 897 |
| 2. Add to 13 | | Easy 1 | 72% 313 / 435 |
| 3. It's over for you. (if you can't do this) | | Easy 1.5 | 20% 193 / 979 |
| 4. Know your limits. (Easy version) | Data StructuresNetworking Akuna Capital +1 | Easy 1.5 | 29% 142 / 494 |
| 5. Know your limits. (Hard version) | Data StructuresBasics Akuna Capital +1 | Easy+ 2 | 31% 77 / 247 |
| 6. Crafter | | Easy+ 2 | 9% 50 / 558 |
| 7. burn this image into the retina of my eye | Machine LearningBasics Meta | Easy+ 2 | 78% 54 / 69 |
| 8. CorrelationTTV (Easy version) | | Easy+ 2 | 19% 52 / 275 |
| 9. Pixel Budget | Data StructuresAlgorithms Anthropic +1 | Easy+ 2.5 | 77% 34 / 44 |
| 10. Ok Garmin, save video | BasicsData Structures Amazon | Easy+ 2.5 | 51% 50 / 99 |
| 11. Ouroboros | | Easy+ 2.5 | 45% 43 / 96 |
| 12. Unique Pointer 2 Parts | | Easy+ 2.5 | 80% 4 / 5 |
| 13. Let's Connect! (Easy version) | BasicsGame Theory Citadel | Normal 3 | 68% 21 / 31 |
| 14. The Answer to the Ultimate Question of Life, the Universe, and Everything | Memory ManagementBasics HRT | Normal 3 | 15% 81 / 543 |
| 15. Tetris | OOPData Structures GSA +1 | Normal 3 | 100% 1 / 1 |
| 16. Down the Rabbit-Hole | MathMachine Learning Jane Street +1 | Normal 3 | 51% 24 / 47 |
| 17. Vector (Easy version) 2 Parts | BasicsData Structures Squarepoint | Normal 3 | 10% 29 / 294 |
| 18. Stronger Together | | Normal 3 | 83% 24 / 29 |
| 19. Deque 2 Parts | Memory ManagementData Structures | Normal 3.5 | 100% 1 / 1 |
| 20. Time-Windowed Join | BasicsData Structures Google | Normal 3.5 | 59% 17 / 29 |
| 21. The Amazing Race 1 | | Normal 3.5 | 13% 16 / 126 |
| 22. The Endless Expanse Project 1 Part | | Normal 3.5 | 29% 7 / 24 |
| 23. Shared Pointer 2 Parts | | Normal 3.5 | 67% 2 / 3 |
| 24. One step forward, two steps back | Machine LearningMath Anthropic +1 | Normal+ 4 | 86% 6 / 7 |
| 25. Escape the Matrix | Data StructuresMath Voleon +2 | Normal+ 4 | 25% 15 / 61 |
| 26. Omniscient Reader's Viewpoint | | Normal+ 4 | 53% 8 / 15 |
| 27. We live in a simulation. | | Normal+ 4 | 88% 15 / 17 |
| 28. Hash Map 2 Parts | | Normal+ 4 | 100% 1 / 1 |
| 29. CorrelationTTV (Hard version) | | Normal+ 4 | 8% 12 / 160 |
| 30. You're naive. | | Normal+ 4 | 35% 8 / 23 |
| 31. Return Routing Engine Debug 4 Symptoms | PracticalSystems Amazon +1 | Normal+ 4.5 | 44% 4 / 9 |
| 32. Multidimensional Virtual Arcade | Design PatternsGame Theory Citadel +1 | Normal+ 4.5 | 4% 4 / 98 |
| 33. Ordered Map 2 Parts | | Normal+ 4.5 | 100% 1 / 1 |
| 34. Hashring | Data StructuresBasics Anthropic | Normal+ 4.5 | 15% 8 / 53 |
| 35. One, Two, Skip a few... | Data StructuresMemory Management Optiver | Hard 5 | 36% 17 / 47 |
| 36. Knock on wood | ConcurrencyDesign Patterns Nvidia +1 | Hard 5 | 16% 13 / 79 |
| 37. Do you think he clicks? | | Hard 5 | 29% 10 / 35 |
| 38. We were all SYNners. | | Hard 5 | 26% 10 / 38 |
| 39. Pardon my... | Memory ManagementData Structures +1 | Hard 5.5 | 29% 5 / 17 |
| 40. Return by Death | Machine LearningBasics Anthropic +1 | Hard 5.5 | 100% 4 / 4 |
| 41. Design an in-memory file system | Data StructuresMemory Management Meta +1 | Hard 5.5 | 17% 7 / 42 |
| 42. I'm single. | Operating SystemsDesign Patterns Akuna Capital +2 | Harder 6 | 12% 18 / 149 |
| 43. Let's Connect! (Hard version) | | Harder 6 | 8% 7 / 83 |
| 44. cant erase u | Memory ManagementDesign Patterns | Harder 6 | 9% 5 / 57 |
| 45. Porphyrophobia | Design PatternsData Structures Meta +1 | Harder 6 | 17% 8 / 48 |
| 46. The NOexistenceN of you AND me | Design PatternsData Structures Millennium +1 | Insane 7 | 100% 5 / 5 |
| 47. Return to Sender | | Insane 7.5 | 21% 6 / 29 |
| 48. Vector (Hard version) 3 Parts | Memory ManagementData Structures Squarepoint | Insane 7.5 | 4% 6 / 157 |
| 49. Pool party! | Design PatternsData Structures Akuna Capital +2 | Expert 8 | 5% 7 / 138 |
| 50. My little tokenizer can't be this greedy?! | AlgorithmsData Structures +1 | Master 9 | 33% 2 / 6 |
| 51. Consumerism (Easy version) | Data StructuresConcurrency +2 | Master 9 | 16% 9 / 58 |
| 52. Stacked up (Easy version) | Operating SystemsConcurrency +1 | Master 9.5 | 16% 4 / 25 |
| 53. Consumerism (Hard version) | ConcurrencyOperating Systems +3 | Grandmaster 10 | 30% 9 / 30 |
| 54. Stacked up (Hard version) | Memory ManagementOperating Systems +2 | Glitched 11 | 38% 6 / 16 |