I started a weekly stock simulator game at my shop for the guys hoping they might learn a little about money management. The rules are only...you can use whatever simulator you want as long as there is no delay in market price at order fill, any positive percentage greater than my own wins... winner decided at mkt close fri. The prize builds up on weeks with no winner so it has gotten up to $80 at a time.
One guy went up 38% in a matter of a couple of hours. He showed me what he is doing. He picks a low dollar stock (around $5) that is going sideways....ie up a penny....down a penny. He sets a $20k limit buy for the bid price then as soon as it fills he sets a sell at one penny higher...once it fills he repeats over and over. and in a matter of 15-20 minutes he was up 20%. I spent a couple of hours trying to duplicate this on thinkorswim paper and even let him try and we cannot make it work.