Recently I attended a hiring drive in Moonfrog Labs for an SDE2 role. Here's my experience of the F2F interviews:

Round 1: Cultural fit round (~15 mins)

• A simple and informal discussion on my past experience, what does Moonfrog do. I was told to ask questions about the company if any.
• Just a discussion round
• Was asked why a switch from different domain to a Gaming company.

Round 2: LLD (>2 hrs)

• Was asked to build simple Snake and Ladder. The code has to be extensible and according to design principles.
• There were several follow-ups, e.g., limiting no. of chances if 6 comes, reducing the probability of getting high numbers on die as the player reaches near to finishing point.
• The interview was >2 hrs long. The interviewer was very helpful and supportive. Overall a good discussion
• Assumption: A working code is expected

Round 3: LLD + Problem solving (1 hr)

• Was asked to design a LFU cache
• Discussion of class diagrams, behaviors, and relations was done.
• Was told to implement one functionality end-to-end
• Interviewer was helpful
• Assumption: Typical LLD interview format

Round 4: HM Round (Resume deep dive + LLD) (1 hr):

• Was asked to optimize design solution in Round 3.
• There was a very deep discussion on my Resume and past projects.
• Was asked LLD of Chess.
• 2 Interviewers were there (One shadower). Both were quite supportive.

Verdict: Selected

Hope this helps!