UK - Where can I play online games that gives you either prizes or cash?

I play on a site called playandwin.co.uk which gives a mixture of games, including cards, puzzle etc and you convert your winning tokens into tickets to go into a random draw. Does anyone know of any other similar sites where you can either win cash or prizes and I don't mean sites like bingo etc where you deposit first! A site that has strategy/puzzle/cards etc. Many thanks in anticipation :)