Flabbergast is the perfect place for your child’s birthday party a short drive from Brookfield, we have 15,000 square feet of fun.  Loaded with inflatable slides, jump houses, tunnels, obstacle course,  arcade games and more.  We guarantee FUN!   Your children and their friends will talk about birthday parties at Flabbergast until their next one!

Parties 300x188 PartiesFlabbergast has four spacious private party pods.

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Party Policies

Flabbergast requires a VALID credit card to be on file.  This card can/may be used to secure the non-refundable $50 deposit.  The credit card is also required to be on file for any damage or incidental charges that may occur during the course of your party.  Flabbergast reserves the right to charge any and ALL applicable charges that you have incurred.

Added Guest Policy

Number of guests is limited as specified. Additional children for any party are $10.95 each. Parents & children under 18 months are NOT included in total size and ALWAYS FREE.  Children that are between 18-23 months are $6.95.

Additional Adults

Flabbergast is a child-first facility.  In an effort to be sure Flabbergast is accommodating the available capacity of children for not only your party, but for all parties and walk-in families, the maximum adults that can be in attendance of your party will be 10 adults.  Flabbergast will implement a $2.95 charge per additional adult thereafter.

Party Format

The Play Arena is SHARED and you should expect that your party will overlap with other parties in the play arena. Your party room is private at all times and available to you for the last 30 minutes of your party time. Party children start off playing in the jump and climbing arena for the first 60 minutes, then move to the arcade for the next 30 minutes. All parties are concluded in the party room and children are picked up by parents in the party room. Party admission is good all day. Party start times are staggered between the rooms to ensure a safe, enjoyable arena time.

Party Rooms

We do not allow outside decorations. A cleanup fee of $25 will be assessed in the event of excessive decorations. We allow outside paper products to be brought in. There will be no adjustment to your package price.

Party Pizza

Pizza orders will be taken at your 48 hr confirmation call.  Options are ONLY cheese, sausage or pepperoni.  There cannot be any substitutions or exceptions made.  Additionally, there CANNOT be any outside pizza brought into our facility.

Outside Food Policy

Other than birthday cakes (and only if you have a scheduled party), no outside food or drinks are permitted by Flabbergast.

In order to assure a safe and pleasurable experience Flabbergast staff enforces a strict code of conduct.


Don’t forget birthday parties at Flabbergast are convenient as we are located in Sussex a short drive from Brookfield, Waukesha and Milwaukee.