If the Hundred Years' War had been fought with paintballs instead of rifles, it might still be happening, but it'd be so colorful that no one would mind. Experience your own vibrant battlefield with today's Groupon: for $20, you get a day of paintball that includes a marker, 500 paintballs, all-day compressed air, and safety equipment at Paintball Asylum (a $40 value).

Paintball Asylum equips paint-slingers with all the gear needed to tackle a 40-acre wooded playing field landmarked with castles, forts, and villages, or one of its three professional-grade turf fields. Before hitting the battlegrounds, the adventure begins at the shop, where the Asylum's techs outfit each player with his or her weapon for the day––a Tippmann 98 custom paintball marker or a box of 64 Crayolas. Visitors then strap themselves with 500 paintballs, a refillable 3,000-psi steel air tank, a 200-round paintball hopper, and a barrel bag. To prevent injury, sharpshooters don chest protectors that guard torsos from paintball tickle squads, and goggles that shield eyes.

While on the wooden playing field, watch your flank when sneaking past buildings, scrambling across bridges, or ducking behind cars totaled by a hailstorm of paint. Players and their trusted allies can stage an assault on a series of castles, including one positioned in the middle of an island that can only be reached by passing two bridges over the creek. The turfed fields, on the other hand, are designed for fast-paced games that emulate pro tournaments organized by two different professional leagues.

All players must sign a waiver that can be downloaded and completed before the visit. All players under 18 must have their waiver signed by a parent or guardian.