So, a perfectly placed grab on Hex-A-Gone sent the last opponent in a 4v3 falling to their doom, leaving myself and one other random teammate alive.

But at the result screen, the game bugged and said I lost in the 3rd round.

A restart seems to have made sure the win counted for the challenge at least, but I am still down 20 shards. (I don't care about the actual shards too much, I care about it when it messes up my spreadsheet.)