(READ ALL IMPORTANT) don't play on fullscreen it ruins money per sec icon but you can still do it if you want (for clicking) sure. Press the green flag twice at the beginning. Click at the monsters to kill them and get coins. Every ten monsters you kill, you progress a level. HEROES: -Cid costs ten coins and gives you +1 damage/click when you hire him. (I recommend getting 10 damage because then you 1 hit the monsters :D -Treebeast costs 100 coins and gives you +1 coins/sec when you hire him. this glitch on fullscreen. Ivan costs 250 coins and gets you +1 coins/kill (useful :D) Brittany costs 1000 coins and gives you an +1 autoclicker/second (For every autoclicker it clicks once every second) ( also good for afk).
basically old but better shop items and new character click last unit few times around it if it doesn't work. Thanks to @cs3211690 for the original project Clicker Heroes. Thanks to @cs544305 for the very original project Clicker Heroes.