Explode-o-nut

The Explode-o-nut is a red version of a Wall-nut found only in the Mini-Games Wall-nut Bowling and Wall-nut Bowling 2 that blow up with a range of a Cherry Bomb. They do not cost any Sun, as the Wall-nut Bowling games are conveyor-belt levels. If you blow up more than five, it will still not award you the "Roll Some Heads" achievement. They do not blow up if they do not hit a Zombie.

Strategy
Just save them up for waves of zombies. They will blow up the instant they touch a zombie. They are powerful enough to immediately destroy any zombie (except the Gargantuar), making them great opponents for tougher zombies like the Buckethead Zombie, Screen Door Zombie or Gargantuar.

To make full use of the explosion area, instead of rolling them at a group of zombies, wait until the group of zombies crosses the line far enough and plant one in the middle of them. Also roll them on rows 2 and 4 for a flat wave of zombies, as they explode every zombie on the screen (excluding Gargantuars).