I do not have 1.20 OEM. I have 1.00g OEM. However, I have the 1.20 demo (I got it when I preordered JJ2). The OEM is so much better than 1.21-1.23 it's funny. True, 1.00g doesn't have online play. But the 1.20 demo did. The OEM game has loads of bug fixes not found in 1.23. The only downside to 1.00(there were 1.00a through 1.00h, so insert a letter from a to h here) is that it includes no level editor. However, I personally think 1.24x is the best version. And I depart now.