howdy, glad to hear you had fun ^^
unfortunately some games are a bit harder than others, but everything involves the mouse, there are a few games with arrows, if it's the one with the keyboard then press the keyboard below the screen on the side to which the arrow is pointing! If it's the one of pixel Coots standing in Ludwig's room, then it just means you have to move your mouse up and down quickly to do the luddy ^^
hope that helps, and if you weren't able to reach the boss at round 30 in regular, then I hope this helps you get there! :>