Remove the horizontal Girder and draw one under the M-Token. Start the Mini on the bottom and as soon as he bumps against the vertical Girder and starts walking to the right, delete it and redraw it ...
Remove the Ladder and cover the Spikes on the right with the Girder from the top. Start the Minis and as soon as Mario passes the Blue Rivet, draw a Ladder so the Toad heads up but Mario continues ...