Heya mate, I was playing BO2 zombies the other day and I found about a neat way to maybe more reply value. In BO2, you don’t just pick a zombies map, but they let you add modifiers like starting on higher rounds, headshots only, etc. It might be cool to add some challenge modifiers, like no power-up drops, one-hit game over, no jumping, no sprinting, upgrading giving gun modifiers but no increase damage, etc.
And if you can be bothered, some sort of leaderboard where players can see other people’s high rounds on different challenges to inspire them to give it a try. I know it’s just a free project for now, but I’d definitely pay money for a cool little zombies clone that gives me competitive entertainment like that.