If you've seen this
then you may have already had a go yourself, but if not, have you ever wanted to feel what it's like to perform a heart transparent? Well... then this is probably not going to go that far to satisfy you, but it's pretty fun all the same.
You can download it here
, just click the link and scroll down and select whatever OS you have, it doesn't need to be installed, just extract and run it and you're there.
How fast can you do it, and with how much blood left?