Don't really actively use this site, but I want to get back into singleplayer games and this feels like a good motivator to do so :)
Using this comment as an easier way to keep track of the games, not really a big fan of the collection system.

Since I mainly speedrun games, I'm only counting casual playthroughs.

✅ - Finished 8 / 50
📒 - Planned 25 / 50
⬛ - Left 25 / 50

📒 1. A new game (released within the past year) - The Big Catch
📒 2. An old game (released 10+ years ago) - Brothers: A Tale of Two Sons
📒 3. A really old game (released 20+ years ago - Syberia
⬛ 4. An ancient game (released 30+ years ago)
⬛ 5. A time sink (50+ hours)
⬛ 6. A quickie (less than an hour)
📒 7. A remake or remaster of a game - Black Mesa
📒 8. A game with 6+ endings - The Stanley Parable: Ultra Deluxe
📒 9. A collection of games - The Sly Collection
⬛ 10-1. A game that’s title starts with a number
⬛ 10-2. A game named after the main character
📒 10-3. A game that starts with the letter Q or Z - Quern: Undying Thoughts
📒 11. A game from a genre you don’t normally play - Tunic
⬛ 12-1. A game adapted from another medium
⬛ 12-2. A game adapted into another medium
📒 13-1. A game with a short title (4 letters or less) - Prey
⬛ 13-2. A game with a long title (8+ words or a word with 13+ letters)
⬛ 14-1. A game with over 1k completions
⬛ 14-2. A game with under 100 completions
⬛ 14-3. A game with no recorded completion times
📒 15-1. A game you previously retired or shelved - Return of the Obra Dinn
⬛ 15-2. A replay
⬛ 16. A game that’s been a Game of the Month
⬛ 17. A game chosen by the HLTB randomizer
⬛ 18. A game with a real or fictional religion
📒 19-1. A “threequel” (third part of the series) - BioShock Infinite
✅ 19-2. A spin-off - Half-Life: Opposing Force
✅ 20. A cornerstone of gaming culture - Half-Life
⬛ 21. A game where you play as an anti-hero or villain
✅ 22. A game heavily featuring zombies - Half-Life 2: Episode One
⬛ 23. A game that hasn't aged well
📒 24. An indie game - Rain World
✅ 25-1. A game that takes place after a timeskip (5+ years) - Half-Life 2
✅ 25-2. A game that takes place at the same time as another game in the series - Half-Life: Blue Shift
📒 26. A sequel that's more famous than the original - Portal 2
⬛ 27. A game that has no business being in its series
✅ 28. A game from a franchise that rarely gets new games - Half-Life 2: Episode Two
⬛ 29. A game with an interesting hook
⬛ 30-1. A game with a great plot twist
⬛ 30-2. A game with a bad plot twist
📒 31-1. The definitive edition of a game (or GOTY edition, Ultimate Edition, Deluxe edition, etc.) - Deus Ex
⬛ 31-2. The base game version of a game with several DLCs or Editions
⬛ 32-1. A platform exclusive
📒 32-2. A game available on 7+ platforms - The Elder Scrolls V: Skyrim - Special Edition
✅ 33. A game you beat to 100% completion - LEGO City Undercover
⬛ 34. A game that started a long-running franchise (7+ games)
⬛ 35. A recent (within the last 5 years) game in a long-running franchise (7+ games)
⬛ 36. A game that's smaller than 100MB
⬛ 37. A game that won any category in the SPIKE Video Game awards or the Game Awards hosted by Geoff Keighley - Elden Ring
⬛ 38. A game that made it out of Development Hell (5+ years)
⬛ 39. A game where the characters speak a language you don't understand (can be real or fictional)
⬛ 40. A game with a memorable soundtrack
⬛ 41. A game on someone else's Game Challenge 2025 list
⬛ 42. A game with a female protagonist
⬛ 43. A game inspired by Mythology or Folklore
⬛ 44. A game inspired/based on real world historical events
📒 45. A game developed by a single person - Undertale
✅ 46. A fanmade/bootleg/rom hack game - Entropy Zero
⬛ 47. A game that won or was a finalist for a Steam Award
⬛ 48. A game with a silent protagonist
⬛ 49-1. A game that features time travel
⬛ 49-2. A game that features space travel
📒 50. A game that prominently features food/cooking - The Long Dark

⬛ B1. A replay on a harder difficulty than your first playthrough
⬛ B2. A replay where you get a different ending from your first playthrough
⬛ B3. A replay that you finish quicker than your first playthrough
⬛ B4. A replay in new game+