Dendrite
This game is made up entirely of blocks. Kind of ugly in your opinion, but you guess they're going for the whole retro thing. You download and begin playing.
Three days later, you emerge from your diamond mine and climb a series of spiral staircases up to the top of your castle (complete with wool dragon and snow golem damsel). You gaze upon the sun as it rises over the horizon, gracing your beautiful kingdom with light. The evil that roams the land is vanquished at the base of your impenetrable castle walls. You love the smell of burning zombie in the morning.
You have a feeling that you were supposed to do something, but you can't quite remember... Ah, yes, you were going to rig a secret entrance to your farms with redstone! You wait until the last skeleton is incinerated by the light of day, and then you set off to begin your task.
By ShiraCheshire