The goal of the game - not to let enemies destroy your castle at each level, by summoning ponies for gold and diamonds, that fight the enemies or provide other support. The amount of gold increases automatically every second, the amount of diamonds increases for destroying enemies and is saved between levels. Also, between levels, you can purchase level increase and additional upgrades for ponies.

Characteristics of ponies:

• Applejack fights monsters in melee holding them back.
• Pinkie Pie with her presence increases the power of all attacks.
• Rainbow Dash flies over the battlefield dropping stones that deal damage. 
• Flattershy with her presence makes all enemies on the battlefield to retreat at low speed.
• Rarity replenishes the gold stock by the end of her activity. 
• Twilight Sparkle attacks the nearest monster with a laser.