Four and Five time multiplier. Check out the verified contract source code on etherscan.io.
Still very early to get in.
0xa379bbdd0af814502eb9b38d475c7fa7411bb4ec
and
0x37b53b46fa74ac3f9b4340dc5a39aabb0f2afa33
This one is only a x2 and only deposit multiple of 100 ETH but x2 seems more realisitc