Click on the screen or press space to place blocks. Click the number keys to shuffle through the different kinds of blocks. 1- dirt 2-stone 3- white (in case you misplaced a block, put white over it to delete it) Arrow keys to move touching stone lifts you up touching the edge brings you to a new world and clears all your building.
My first version of minecraft is better, http://scratch.mit.edu/projects/44710666/?mode=player&fromexplore=true#player
