Cat Got Your Tongue is challenge #8. Isaac starts this challenge with Guppy's Head, Guppy's Tail, and Guppy's Hair Ball, as well as three Soul Hearts and three Black Hearts, as well as his usual three Red Heart containers. Isaac is also blindfolded. This challenge is unlocked by transforming into Guppy. The goal is to defeat Mom.
- As a result of the blindfolded status, tears cannot be used, and Isaac must rely heavily on the erratic movement of Guppy's Hair Ball to do damage.
- Because Isaac starts with 3 Guppy items, he begins the challenge as Guppy, which grants flight (a good way of avoiding damage) and generates Blue Flies when dealing damage with familiars or a co-op baby.
- Guppy's Hair Ball also creates blue flies when dealing damage which is a feature unique to challenges where Isaac is blindfolded, making it considerably stronger than normal.
- Due to this challenge requiring the player to get up close and personal to enemies, ones that explode upon defeat can pose considerable risk to the player. It's recommended to use Guppy's Head to generate flies to fight the explosive enemies for you.
- Guppy's Hair Ball is very difficult to control. It would be wise to spend the first few attempts at the challenge by practicing with it before a real attempt at completing the challenge is made.
- Items that increase movement speed can make Guppy's Hair Ball somewhat easier to use. The extra speed will allow for more precise control while also increasing the range indirectly at which the Hair Ball can safely be swung.
- Buying 9 Volt from a Shop or finding the Fish Tail can allow more Blue Flies to be spawned by Guppy's Head.
- BFFS! is a noteworthy item due to its effects on Guppy's Hair Ball.
- Orbitals, such as Cube of Meat and Sacrificial Dagger, can be more effective than Guppy's Hair Ball at blocking and dealing damage.
- Hive Mind greatly increases the damage of Blue Flies.
- Incubus is a notable item for easing up the challenge, essentially turning it into a slightly harder Lilith run.
- Red Candle or The Candle can be useful alternatives to Guppy's Head, depending on the situation.
- Bob's Brain, while dangerous, can serve as a reliable alternative to bombs.
- Spear of Destiny can trivialize the challenge by providing an easy-to-use alternative for dealing damage.
- Rune of Algiz - Complete Cat Got Your Tongue (challenge #8).
- "Cat got your tongue" is an idiom for when people are speechless.
- Aside from the obvious change in language, the Korean unlock for the challenge is notably different. Instead of a cat eyeing a hairball, it seems to depict a cat eating the hairball back.
|1. Pitch Black||2. High Brow||3. Head Trauma||4. Darkness Falls||5. The Tank|
|6. Solar System||7. Suicide King||8. Cat Got Your Tongue||9. Demo Man||10. Cursed!|
|11. Glass Cannon||12. When Life Gives You Lemons||13. Beans!||14. It's in the Cards||15. Slow Roll|
|16. Computer Savvy||17. Waka Waka||18. The Host||19. The Family Man||20. Purist|
|21. XXXXXXXXL||22. SPEED!||23. Blue Bomber||24. PAY TO PLAY||25. Have a Heart|
|26. I RULE!||27. BRAINS!||28. PRIDE DAY!||29. Onan's Streak||30. The Guardian|
|31. Backasswards||32. Aprils Fool||33. Pokey Mans||34. Ultra Hard||35. Pong|
|36. Scat Man||37. Bloody Mary||38. Baptism by Fire||39. Isaac's Awakening||40. Seeing Double|
|41. Pica Run||42. Hot Potato||43. Cantripped!||44. Red Redemption||45. DELETE THIS|
|The Binding of Isaac: Rebirth|
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