Need ideas for a party, eg like drinking games?

I'm having about 20 girls over for a party, after a breakup with my long relationship. The plan is the basically let our hair down and get really drunk and just a a load of fun, but I need drinking games, and other fun cool stuff to do?
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It is my 18th by the way so it can be alcoholic
Need ideas for a party, eg like drinking games?
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