Apologies if I've managed to overlook someone else posting this (I am rather blind at times, but I did look!), but the BBC site has a brand new site based game called
The History Hunt. It's definitely worth a look just for the video of Amy talking to the TARDIS. And her English accent. <3
Also there wasn't a game or website tag so I wasn't sure what to tag it. o.o
ETA: Non-UKers might be unable to see the videos. And some of the puzzles are locked till the 13th.