You'll first do a technical phone screen where you're asked to code live in a Google Doc. The first part you just need to write out some function signatures. The second part is you have to use those functions to solve a specific problem, then you're asked about how you could have improved on the algorithm.
If you make it past that step, they bring you onsite, where you interview engineers and designers and lastly the CEO. The engineers will ask you more algorithm questions. Designers will ask you more generalized questions and behavioral questions to see if you're a good fit for the team and have decent game knowledge. The CEO will tell you about the company and answer any additional questions you have as well as making sure you're a good fit for them. Greg (the CEO) is very transparent so you should feel comfortable asking him anything.
If you do well on that they'll send you an offer.