How to Go Fast

Go through every doughnut possible
Try not to bonk on anything. (Except balloons.)

Those tips are obvious, however, there are some that are not.

The Egg is actually the fastest Stone available
The more you move around, the slower you fall (air resistance?) so try moving as little as possible.
Sometimes, going through a doughnut can lose time due to the time loss caused by moving to it. This usually isn't the case.
Here is a a cool idea for you to experiment with if you want to.

Interestingly, if you are going fast enough (and I think some rng comes into play here) then you can clip through an object without losing any perceivable speed. This makes it possible to clip through a doughnut but still get its speed boost. This saves time because instead of moving over the center of the doughnut, you only need to get as far as the edges of it.
This could also potentially allow for some big timesaves by clipping right through obstacles instead of maneuvering around them.

How to Unlock All of the Stones

The Stone and Bouncy Ball are unlocked by default at the start of the game.

Iron Ball: Beat any well with the Bouncy Ball.
Jewel: Beat Well 3 with the Iron Ball.
Matryoshka: Beat Well 4 in under 1m 10s.
Wooden Fish: Beat Well 6 in under 1m 05s.
Watermelon: Beat Well 7 in under 1m 10s.
Plate: Beat 5 different wells with the Matryoshka
Egg: Beat Well 8 with the Matryoshka.
Mutagen: Beat Well 10 with any stone.


Note: I can't find a reliable source that explains how to unlock the Plate.

Stone Speeds

This is my attempt at measuring the speed of each stone using the in-game speedometer. Keep in mind that it is likely that I made some mistakes. Be that as it may, these measurements should be relatively close. Also I'm not done measuring the various speeds yet but I'm lazy so I'll submit this as it is and update it in the future.

MAXIMUM FALLING SPEED:

Stone: 89
Bouncy Ball: 70 
Iron Ball: 83 
Jewel: 113 
Wooden Fish: 94
Watermelon: 89
Mutagen: 134
Egg: 134
Plate: 108

MINIMUM FALLING SPEED:

Stone: 74
Bouncy Ball: 55

Stone Stats

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

Name	Author
How to Go Fast	Laxxius 7 years ago
How to Unlock All of the Stones	Laxxius 7 years ago
Stone Speeds	Laxxius 8 years ago
Stone Stats	Laxxius 7 years ago