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Which tower defense games actually get played?

57 tower defense games owned in at least 30 of the libraries read here, ranked by how many owners got past Steam’s two-hour refund window. Across all of them it’s 45%.

S4 games
  1. #1Bloons TD 681% of 222
  2. #2Orcs Must Die! 274% of 108
  3. #3Dungeon Defenders74% of 84
  4. #4PixelJunk™ Monsters Ultimate78% of 40
A11 games
  1. #5GemCraft - Chasing Shadows74% of 38
  2. #6Bardbarian75% of 32
  3. #7Particula63% of 75
  4. #8Terrorhedron72% of 32
  5. #9Defense Grid: The Awakening67% of 36
  6. #10Space Run67% of 33
  7. #11Cosmic Dust & Rust65% of 31
  8. #12AI War: Fleet Command59% of 39
  9. #13Rock 'N' Roll Defense56% of 50
  10. #14The Culling Of The Cows55% of 60
  11. #15Plants vs. Zombies: Game of the Year52% of 125
B18 games
  1. #16Commando Jack57% of 35
  2. #17Kingdom Two Crowns52% of 110
  3. #18Dome Keeper52% of 93
  4. #19Kingdom Rush56% of 36
  5. #20Space Run Galaxy56% of 34
  6. #21Two Worlds II Castle Defense56% of 32
  7. #22Ancient Planet57% of 30
  8. #23CastleStorm55% of 31
  9. #24Kingdom: New Lands51% of 91
  10. #25Fortified52% of 56
  11. #26Defend Your Life51% of 47
  12. #27Battle Ranch50% of 34
  13. #28Legion TD 249% of 35
  14. #29Warstone TD48% of 33
  15. #30The Last Spell47% of 32
  16. #31Mindustry45% of 44
  17. #32Rock of Ages42% of 55
  18. #33Bloons TD539% of 31
C14 games
  1. #34Orcs Must Die! 340% of 62
  2. #35Anomaly Defenders39% of 41
  3. #36Super Sanctum TD37% of 30
  4. #37Nordhold37% of 38
  5. #38Rock of Ages 3: Make & Break36% of 39
  6. #39Wall World36% of 42
  7. #40Heretic's Fork35% of 49
  8. #41Rock of Ages 235% of 49
  9. #42Revenge of the Titans32% of 37
  10. #43Diplomacy is Not an Option33% of 40
  11. #44Sanctum 236% of 132
  12. #45Dungeon of the ENDLESS™35% of 158

And 2 more: Orcs Must Die!, The Riftbreaker.

D10 games
  1. #48Go Home Dinosaurs!21% of 39
  2. #49Dwarfs!?17% of 36
  3. #50X-Morph: Defense23% of 62
  4. #51Sanctum20% of 70
  5. #52Ultimate Zombie Defense19% of 90
  6. #53Cubetractor5% of 40
  7. #54Fluffy Horde0% of 40
  8. #55World Crafter TD6% of 54
  9. #56Yet Another Zombie Defense HD11% of 97
  10. #57Aegis Defenders4% of 90

Counted from the Steam libraries read here, by the hours Steam has on each game; free games are left out, since Steam lists one as owned only once it has been played. A game owned in only a few libraries is pulled toward the kind’s 45% as if 60 more owners had played it like the typical one, so a lucky handful can’t top the list. S is the top 8%, A the next 20%, B the next 30%, C the next 25%, D the rest.