Are you one of the half-dozen people who don't own Terraria yet? Well you're in luck, because it's currently on sale so you can grab it on the cheap. It won't be any easier (those boses can be a handful), but Terraria for the price of a 2 liter is still tough to pass up.
The super-popular crafting/adventure/survival game has been brought to just about every platform in existence at this point, but if you want a great on-the-go version it's a good fit for the iPhone. Plus it's cheap, as I've said. Like $1.99 cheap.
If you've been on the fence for a while, now is as good a time as ever to grab Terraria.