This is just a list of the various stats the stones in Kersploosh have, and how they compare with each other.

Speed:

1. Mutagen – 10★
2. Egg – 9★
3. Jewel – 8★
4. Plate – 7★
5. Matryoshka¤ – 6★ ~ 10★
6. Stone – 5★
7. Wooden Fish – 4★ 8 ) Watermelon – 3★
8. Iron Ball – 2★
9. Bouncy Ball – 1★

Boost:

1. Iron Ball – 10★
2. Watermelon – 8★
3. Bouncy Ball – 7★
4. Wooden Fish – 7★
5. Plate – 6★
6. Egg – 5★
7. Stone– 3★
8. Matryoshka – 3★
9. Mutagen – 3★
10. Jewel – 2★

Overall:

1. Egg – 14★
2. Plate – 13★
3. Mutagen – 13★
4. Iron Ball – 12★
5. Wooden Fish – 11★
6. Watermelon – 11★
7. Jewel – 10★ 8 ) Matryoshka¤ – 9★ ~ 13★
8. Stone – 8★
9. Bouncy Ball – 8★

Durability:

1. Bouncy Ball – ∞hp
2. Iron Ball – 999hp
3. Wooden Fish – 500hp
4. Plate – 300hp
5. Watermelon – 200hp
6. Stone – 100hp
7. Jewel – 80hp 8 ) Egg – 50hp
8. Matryoshka¤¤ – 5hp
9. Mutagen – 1hp

¤The Matryoshka has 6★ speed by default, however, the Matryoshka's description says that each time it loses hp, it gets smaller and faster. I am not sure if the Matryoshka's speed gets incremented by a whole ★ every time it loses hp, or if its speed only increases by less than or more than one ★. If the Matryoshka's speed increased by one ★ each time it took damage, then it would have between 6★ and 10★ depending on its hp.

¤¤The Matryoshka can only take 1hp of damage at a time, no matter how hard it is hit. Every other stone can lose more or less hp depending on how hard it is hit. This means that in some cases, the Matryoshka might be more durable than the Egg, the Jewel or even the Stone.