The social bonus is a special prize awarded to the last players who cash out before the game crashes. In BlastCrash, securing this bonus is essential for skilled gameplay, as it helps to counteract the house edge. Each player’s stake contributes 0.5% to the bonus pot.
Example:
If there are 4 players, betting 400, 300, 200, and 100, there will be 5 zabos in the pot. If the biggest player wins, he gets the whole pot. The site works out the rate he would be getting if he won, ie. 400 zabos bet gives 5 zabos bonus - or 1/80th bonus per zabos bet. It then applies the same rate to whoever actually wins.
So if the 100 zabos player wins, he gets 1/80th of 100, or 1.25 zabos. That leaves 3.75 zabos in the pot, which goes to the next best placing player(s).
Suppose the 200 zabos player comes 2nd. He is due 1/80th of 100, or 2.5 zabos. There are still 3.75 zabos in the pot, so he gets the full 2.5 zabos he is due - the same as if he had come in 1st place.
Suppose the 300 zabos player comes 3rd. He's due 3.75 zabos but there are only 1.75 zabos left in the pot, so he gets those and that's all. There's nothing left for the 4th or worse place players. 1% of games will instant bust (0x) and no bonuses will be awarded, all other games have bonuses equal to 0.5% of the amount wagered.