We brought my 4 year old here and didn't end up staying. You buy a card with points on it and each activity/game is a number of points. There were only a handful of people there when we visited. I presume they cater more to birthday parties than individuals.
We went to Krazy City for the first time last week. The prices are not outrageous IF all the attractions are open. On the day we went the Rock Wall and Skyscraper were both out of order. My kids did enjoy the bumper cars and the little ones rode the train incessantly.
There is not enough monitoring there. I will never bring my little ones back there again. At other amusement paces, there is usually someone at the doors monitoring who comes in and out or a hand stamp to ensure no one is going to walk out with your kid. Here the doors are wide open to the mall and are a short distance to the parking lot doors.
One staff member took my son's ride/token card from him (when my son gave it to him to swipe for the ride) and put it in his own pocket. My husband had to go back to the guy to get my son's card back after we realized his card was missing. Each refillable card costs $1.