supple wasp
So you start off with 1 map (the 8x8 chunk map/world you spawn in) in the world map view.
That maps starts you off.
When you move outside that map (of 8x8 chunks) the chunks are not saved to the world map since you have not unlocked those chunks and maps yet
you first map would look like this:
that is a 8x8 chunk world
if you want to earn more of the worlds to show up then you can pay a random fee
an adjacent map can be unlocked
be it to the left, right, above or below it
when you want to unlock that map you can click onto it and there would be like a screen/message that could say something like "would you like to unlock this map?"
If you select "No" it cancels viewing the unlock map page.
If you click "Yes" then it moves onto the map unlock page.
A map page is 64 items (8x8=64 items, as there's 64 chunks in an 8x8 chunk world)
To unlock other maps, you pay a fee represented by random items you can get. This fee is in the map unlock page.
the pic above represents most of the items having been unlocked. Once all items are payed for you move onto another screen.
I'm thinking:
for diamonds costs
but having a random chance for slightly more costly maps would be interesting
you can also select a map away from the expansions at a higher than standard cost
(Ignore the numbers in the top corners of the pics)
daring lantern