My favorite monopoly games are those where the players have played together before, and agree on a set of custom rules to the game in advance, and are fast-paced. I remember having rules added like loans and interest, and effectively unlimited freedom to make deals with players. Deals logged on paper, loan interest measured in turns and percentages, so much...fun. Actual fun though. A game like this can even go fast…
1 - Double 1s or double 6s: steal any property from any player. 2 - you can build on any property you own. You’re not forced to build evenly and you’re not forced to own a monopoly on that color.
A 2 player game would last an hour, maybe 2 tops. 4 player still took some time but was still fun and exciting :P
Also, with these rules the balance of the game shifted. BW/PP are good, but not the best. Utilities and railroads are pretty lame. The winning properties seemed to me to be, from best to less best: Orange, Red, Pink, Yellow, Green. Orange and red because they’re properties most likely to be landed on after leaving jail. :)