Get HuniePop on Steam: http://store.steampowered.com/app/339800/ Or the Official Website: http://www.huniepop.com/
After you reach a certain relationship level with a girl, there is a good chance that you'll be able to invite her back to your bedroom. This initiates the puzzle bonus round. In this round, all of your items and strategies go out the window. This round is purely about making as many matches as you can as quickly as you can. Your date's pleasure meter drains very quickly, so if you aren't satisfying her, then you have to move faster.