Each day on the member's site there are hands with a specific declarer play problems suitable for beginners, improvers and advancers. Plus a library of over 1000 hands.
Try the sample hand. Click a card from your hand or dummy when it's your turn to play. Click the 'Play' when it's the defender's turn to play (i.e. you lost the trick).
Play more hands by taking the two week free trial.