In No 10: Full Confidence, external, players who take on the precarious position of prime minister must balance the moods of four factions - their cabinet, backbenchers, the media, and the public - to remain in the game. Decisions are made across more than 300 fictional political scenarios, handwritten by Brewis.
The storylines range from the mundane - dealing with GP appointment waiting times - to the absurd.
"I have a two or three-part storyline where a dog is let loose into the House of Lords by a lobbyist during a vet bill and that spirals out of control," Brewis said.
Each scenario asks players to pick one action from three choices on the screen, with each potentially upsetting or pleasing the different factions.
Much like in real life, if one side completely turns against you your political career is finished.
While some situations may sound farcical, Brewis said he had plenty of real life examples to draw on as inspiration.
"I'd remember that MP who had a spider that he'd threaten MPs with, or when Boris Johnson walked into a fridge. I'm frantically writing them all down."