again get your heroes to 120 then near impossible to continue unless you spend big i paid small thankfully before I realised how poor this game became enemies after stage 15-9 are impossible to kill due to ridiculous amount of heath they somehow get from there special and there special activates 3-4 times before 1 of your does the balance is so poor I had to uninstall as the game just became aggressively annoying to the stage you want to stamp on your phone it's definitely not a F.T.P friendly