The interview process is almost exactly like what others have described on here. However, on the superday that I attended, there was only 2 parts: the business simulation game and panel interviews (if you were chosen to continue forward). They cut about 80% of the interviewees after lunch...some of which were REALLY smart kids from prestigious universities that seemed to do really well during the business simulation. I was chosen to continue forward to panel interviews with the other three candidates remaining.
My two cents about the business simulation: Clearly, based on observation, this company is not looking for the kid that can show off how impressive they are with numbers. They're also not looking for someone that is a rash decision maker, a loudmouth, or someone that would rather work alone than be open within a group setting. TALK through the simulation as much as you can. COLLABORATE with the other members. Ask them questions and make smart, rational decisions TOGETHER. Compliment other people's ideas, but don't be afraid to present your own. Notice how most of the reviews on here mention that the employees supposed to be observing you are on their phone. This is clearly a test. Although it may appear to be incredibly rude and distracting, ignore them and focus on how to showcase how well you work with a team because they're 100% listening and taking notes.
As for the panel, study the questions on Glassdoor, seriously. Every single question the C-level executives asked is featured here by some previous interviewee. Yes, they put you under pressure- it's clearly a test. Keep your cool and really show them how you rationally work through solving the brain teasers that they ask. If you don't know the answer to a question, they won't bite. A lot of these reviews make it seem like the panel executives were mean hearted and out to get you lol. They're actually really nice, and you could definitely tell they had a sense of humor. Play along with it and try to relax is all I can really say.
My best pieces of advice: 1. be yo self. 2. familiarize yourself with what to expect on superday so you don't have a panic attack when you're answering rapid fire questions.