IndoorFieldCamera image will update in seconds Wisconsin's largest indoor paintball facility, at over 59,000 sq. ft. The Largest Indoor field between the Appalachian Mountains and the Rockies. Located just North West of Milwaukee on Highway 45. (262)250-4234 Park Hours: Mon.-Thurs. 11-8 Fri. 11-10 Sat. 10-10 Sun. Noon-4 Open Play Schedule Ages 12+: Sun. 12-4 Wed. 6-10 Fri. 6-10 Sat. 6-10 launch a remote window