HTP : 

• Click on the Timeless Bar, then select as many zombies as you can. (You can’t defeat any zombies unless you select them all.)
• When you pick up the Clown Box, you can throw it by aiming anywhere on the ground. Use it to distract the zombies.
• If you have Glue, sneak up behind a zombie and glue it in place so it can’t move.
• After defeating all zombies, click the Menu button in the top-left corner to proceed to the next level.