List here all types of massive multiplayer browser game mechanics you know. Especially the ones that are the most popular and are used by several games.
STRATEGIES*
Travian/Ogame - each grid on the map/planet can be colonized to hold one city, you build infrastructure in cites which require resources and time, the cost of next level of infrastructure is progressive, you send army to steal resources form other player cities (due to combat casualities these game are focused on constant transfer of weaker armies to avoid combat).
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KoC (Kings of Chaos, most mafia games) - each tick you get gold and turns, you use turns to attack other players and steal their gold, you can bank gold to make it immune to being stolen (in such games the focus is on spending or banking the gold fast).
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RedDragon (and many other) - each acre of land can hold one building which produce some resource or give other bonus/ You get land via exploration (require gold, and the cost is progressive depending on how much land you already have, so it is only usable at the beginning) and conquest from other players. Frequently there is also an option to steal resources.
RPGs*
KoL (Kingdom of Loathing) - there is a pool of locations with varying danger & reward levels. You use turns (you get these each tick/day) to adventure and have encounters in selected location (resulting in combat with monsters and rewards).
UNCATEGORIZED*
FarmVille - you have plots of land and you plant vegetables there, you need to go back (preferably at a certain hour) to harvest them and get cash and seed new vegetables. You use cash to buy more seeds or infrastructure or tools. You can not use cash from vegetables growing to increase the number of available fields (you do it via other means, dunno how through, I'm not sure how that one works
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