Set out cups as per image above. Each cup should have 3 cards with questions / sentences to translate (easy, medium, difficult - I did green, orange, red coloured cards). Split the class into 2 teams. They take it in turns to throw a ping pong ball into one of the cups on the opposite side of the table. Whichever cup the ball lands in is the card they have to translate. You could get them to choose level of difficulty if you trust them, or match it to target levels. If they don't manage to land their ball in a cup have some spare cards so you can still ask them a question. Team with most points at the end wins!
Tip: If using cups like the ones above you may want to stick them down so they don't all get knocked over - I just used blu tack.