Scientists agree the only reason adults have children is so they have a socially acceptable reason to visit amusement parks, eat at novelty pizza arcades, and see movies with Shreks in them. Put some fun in the oven with today’s kid-friendly Groupon to One Stop Fun in Westford. Choose between the following options:

• $25 for 5 all-day passes to the indoor playground (up to a $49.95 value).
• $40 for 10 all-day passes to the indoor playground (up to a $99.90 value).
• $49 for 15 all-day passes to the indoor playground (up to a $149.85 value).
  
  

At One Stop Fun, energized youngsters can romp year-round on an indoor playground packed with three stories of explorable tubes and tunnels. The wave slide and spiral slide encourage career-building skills, providing great practice for navigating firefighter poles or booby-trapped forensic audits. A newly expanded toddler area, prepped for sock-wielding babes who are still finding their footing, means the facility welcomes exercisers ranging from tots to teens.

All-day passes also grant visitors access to an expansive indoor rock wall large enough to challenge scores of children of all sizes and ability levels all at once. Kiddies safely scale an 8-foot-high wall, allowing ample time for envisioning the fantasy of saving a buddy dangling off the face of K2 and totally changing the plot of Cliffhanger.

Adults always visit for free at One Stop Fun, as all kids must have parental supervision. Free wireless Internet access, ample seating, a changing area, and a snack bar keep older guests entertained as they watch over little ones. This Groupon is transferable, so customers can save all five passes for their own precious pal or bring along the local junior barbershop quartet to multiply the day’s collective kinetic energy.