Basic instructions here and in-game. Also read FAQ in notes. Destroy the various objects by clicking on them, or buy Heroes (using the buttons on the left) to increase your DPS (Damage Per Second). When you kill enough monsters, a yellow arrow appears to let you move on. Once you buy Dino (the 11th Hero), you get the ability to Apocalypse. This makes you start from the beginning and lose all your money, DPS and heroes. However, you will gain Crystals, which boost you in other ways. Have fun and see if you can unlock all 23 Heroes!
Based on the idle game Clicker Heroes. Everything else by me (the vector art is mostly done by Scratch's sprite library, with some stuff drawn by me). FAQ: How do I Apocalypse? Once you buy Dino, the button should appear underneath the monsters. Clicking it will show you how many Crystals you will receive. Click again to confirm your Apocalypse, or move your mouse away from the button to cancel. When should I Apocalypse? When you get tired of the game pace slowing! Generally, you should Apocalypse between zones 25 and 35 on your first run. The formula for crystla rewards is your zone number cubed, divided by 80 (rounded of course). What are Crystals used for? Crystals can be used to buy upgrades in the Crystal Shop (click the crystal on the main screen to go to it). It contains extremely powerful upgrades. Unspent crystals give you extra DPS, so don't spend them all! I can't buy [hero]! He's far too expensive! After Phish (Hero 16), the hero prices increase dramatically (by a factor ranging from thousands to many decillions). The DPS does increase by a similar amount though. Apocalypse first to get more Crystals, which might give you the edge you need. I just blew up. Why? Sometimes, you will find bomb enemies. They blow up after 10 seconds, so be quick! If you blow up, you will be sent back to the previous zone. Get more DPS before moving on. Should I always move on to the next zone or wait?