At the time of doing the runs the supernova flash extension was the recommended way by NK to run these games. The NK archives version is slower (I only tested BTD2 which uses the same engine and lags more, dunno exactly how bad that version is for BTD1).

Right now I can't figure out how to play the game with the supernova flash player.

I'd either want more information on how the game can be played with the fastest flash player so I can writeup a guide, or we can discuss adding seperate categories per flash player.