The game is captivating but if I am not mistaken the game hasn't been launched yet. Once it's already operational I might try it as well. The only thing that makes me think about this game is the assurance of provably fair, we are not even sure if those marbles that will be used has the same weight since the gravitational pull is one of the factors that may affect the race and weight has something to do with it, just a guess.
I also pity those hamsters that will be part of this race that they need to run at about 8 kilometers a day, that's really tiring I supposed, and hope they will get a permit first for using a hamster in this game.
Checking their FAQ section - there is question about Mia, the hamster.
So let's assume that everything has been taken care of for Mia.
With regards to the marbles used, we won't know their exact weight unless, the team will show the live weighing of each marble used.
But that's a good question.
And if the OP can also post the official website of this gambling platform. Thanks.
https://mia.bet/