It's nighttime. There is a green monster next to his house.

Hit the green monster with his sword?

It explodes.

Also, he is now being attacked by flying monsters.

Those were his crafting recipes.

He'll go inside and plug up the hole in his wall.

Overnight, he'll mostly just discover new types of blocks made from the new types of rocks. The gold can make tools, the blue dust can make blue dye, and the red dust can make a different kind of torches, which don't provide as much light.

Eric spends the next couple hours remodeling the area surrounding his house, creating a moat so that no green monsters will get close enough to blow it up. Unless they can fly, which is a very real possibility.

And he'll also make a new farm.

After that, he's going to spend more time exploring. He probably has strong enough gear that he can travel even overnight; he's just going to head off in one direction and see where he ends up. And he'll be careful to head only straight in that one direction, with the block-based grid as a guide; he'll need to be able to find his house again when he's done exploring.

Sounds great! He'll discover a new cave, complete with green monsters!

Pass. He has a cave back at home; he's looking for something he hasn't seen before.

Do purple flowers count?

They do not.

There are also some pink trees, but his enjoyment of them may be hindered by the return of the flying monsters!

He's not going to stand and fight yet; he's feeling too hungry. Run. (In the direction of the pink trees... damn it, he's getting off course, but he still knows roughly what direction his house was.)

The flying monsters are very persistent.

Then he'll barricade himself inside a mountain if he has to!

Reminder that he's out of food.

He does not need reminders.

also his body really really hurts -

Shut up. He will sit here for another ten minutes if he has to.

Next morning. Go outside, kill animals, collect meat, cook meat, eat meat, and then look at the trees.

They're pretty much just a different color of trees that drop a different color of wood. There are also mineable pink flower petals on the ground.

Then he'll head back to where he hopes is approximately in a horizontal line from his house, and keep travelling.

He'll pass an even larger cave, or perhaps just a hole in the ground, and another night will force him to seek impromptu shelter in the dirt.

But after that, he'll stumble upon this!