Sort:  

I think that they're supposed to be columns, rows or squares. I was pretty strict on it because I was offering prises for completing them, and didn't want to make it too easy, but you could probably be more flexible. I found that if the 'square numbers' were completed first, then mostly columns or rows fit the rest.

Coin Marketplace

STEEM 0.04
TRX 0.32
JST 0.086
BTC 60139.89
ETH 1573.40
USDT 1.00
SBD 0.42