Paintball is a lot like chess in that both require complex strategizing and both are almost impossible to win against autonomous robots. Opt out of surefire failure with today's Groupon: for $15, you get an all-day field pass at Extreme Sports Paintball in Linden (a $30 value). Avid paintballers can vent pent-up workaday stress on Extreme Sports Paintball's 171-acre woodsball course. Gear and ammo are included; your arsenal consists of a BT-4 paintball gun with a hopper, a barrel cover, a Ninja tank filled with neverending air, and a two-pod pack for carrying your 500 paintballs—enough ammunition to play-shoot your foe once every other year for a millennium. Stop in on a Saturday or a Sunday and trade your signed waiver for a day of speed-painting action.