Got the below question in the interview. What's the best way to solve it?

Question:
Dr Mario us a video game that takes place in an 8 cell x 16 cell board. Each level in the game corresponds to a different number of red, blue and yellow viruses. No more than 2 viruses of the same colors are adjacent vertically or horizontally. The placement of viruses chnages each time the game is played. Write a funtion that given an integer number of viruses as an argument, initializes a game board with random viruses.