In the top left corner of the screen a small template will appear. On your main board (the one with the BLUE wizards) click the wizard which corresponds with the GOLD rings on the small template. Click the ones corresponding with a RED wizard and you will lose a life.
Hurry, for the small template will disappear faster and faster for each level! If it has gone away too fast, you can sacrifice half your points in return for another look at it.
Sometimes, the mean red wizard will try to disturb you by covering the template.
Good luck, and enjoy!