ok first how do you make senarios and can you set specific goals (example kill all unit enemies to win, kill a certain unit, ect.)
and if you can here's an idea how about setting up a team that has several defence towers and a main one for a castle and you build them and try to survive tower defence stile through several attacks of enemies (that have no building but are just at sertain spots and come in waves) and if you survive you win.