Some objectives are present at the start of the level, while others are added during play.

If the player has completed at least 70% of the level before dying, play will begin at the start of the next level instead.

At the start of the level, an enemy is placed directly on top of where the player starts with no way to kill it.

In the building phase, the player builds structures on a pre-defined grid, using the 8 'towers' chosen at the start of the level.

The first 1/3 of the game features linear levels, with the player's goal being to make it from the start of the level to the end.

Prior to the start of the final level, he/she is given the chance to eat a food item for a $100 bonus.

Mid-mission checkpoints so the player doesn't need to return to the start of the level if they die.

Upon beginning a new life, the player resumes the game either from the same location they died, a checkpoint, or the start of the level.

There is an option of 3 chickens at the start of the level, player can use one chicken to skip a particular level.

Game over takes the player back to the start of the current level.