Costume Quest puts you in the shoes of either Wren or Reynold, depending on which character you decide to play as. After your twin sibling is captured by horrible Halloween monsters, you are faced with the task of rescuing them and returning them home before your parents discover the truth.
Your twin is being held behind a mysterious set of black gates that tower over the neighbourhood of Auburn Pines. To get inside, you must complete tasks, collect candy and trick or treat every door you find. Inside each house could be a friendly adult who will shower you with delicious candy, or an angry Grubbin monster prepared for battle.
You will begin your evening in a home-made robot costume, and as you explore the neighbourhood you will find more costume pieces and improvised accessories which will eventually complete various outfits. You'll be able to put on each of the 11 outfits and make use of their magical powers.
To give your costume a bit of a kick, you can purchase Battle Stamps which will provide you with an extra power when fighting enemies. These can be bought using candy which is hidden all over the place. Bin bags, postboxes and pumpkins are all packed with yummy treats, so keep your eyes peeled for some tasty currency.
There are plenty of different areas to explore within the game, including the monster-ridden Autumn Haven Mall and the creepy graveyard of Fall Valley which is filled with eerie surprises. Each area will be packed with different quests and missions which you can view in your handy notebook at any point. Complete missions and battle enemies to earn some very desirable Sweet Treats. Collect all 54 Sweet Treats, including the delicious sounding Fee-Fi-Foe Fudge or rather tempting Cinnamon Brain to earn the Black Cat costume. Nine lives will come in very handy when fighting big bosses.