EDIT;

Actually I should point out that the flashpoint version is NOT the same as dha's WR run. None of the top 3 runs on the leaderboard are using the newer version that's on flashpoint. The gameplay is different between newgrounds (what I think dha used) and flashpoint. The strategies dha uses don't all work on flashpoint. IMO the newgrouns version is nicer to play

I'm going for sub-6 and have been using the newgrounds version. However I notice on some other sites that some levels are beatable quicker. Like on addictinggames level 17 can be done in 1 throw. I don't know which one dha used but as far as I can tell the newgrounds version behaves the same as his