@zeldaking: Thanks! It's written in Lua (better don't look at my code, I think it's horribly written) And yeah, maybe Terraria would've been better to port to nspire, but I don't own a copy of it

@LDStudio: Lol, I wish I could see what you did there ^^ But I just tested the saplings and they work as they sould do. There are some things you should mind:
- saplings must be placed on dirt or grass
- there must be a 4 block high space above them
- they only grow if they are on screen (global update would take too much performance )
- every 0.3 seconds they have a 1/2000 chance to grow

Could someone make/link a YouTube video of it? I don't own a CX, but I am curious

Lol you have to work on the mob spawning :p
I built an beautiful house and a creeper spawned in.
And then... BOOOOOMM

In real Minecraft, mobs only spawn more than 24 blocks away from you - I guess you can implement something similar?

@Vijfhoek & Streetwalker: You're right, I've just read the "spawn" section in the minecraftwiki and it seems to be a bit different than I thought. The group-spawning seems to be a bit too much for only 2 dimensions but I'll implement that maximum constant for monsters/animals. Expect major changes in the spawning and mob management mechanics! That means more time for calculations and that means lag spike but I think I can avoid that by splitting block and mob updates to different ticks

Edit: I have a question:
Should you be able to walk through trees (as you'd be walking in front of them)?

Btw I've finished fire! I think it's very similar to the real minecraft but it would be very easy to adjust combustibility of different materials, speed, spreaing and self-extinguishing!

Ok, here is the new mob logic:
- while generating the world, each grassblock has a 1/10 chance to spawn an animal on top of it
- animals won't despawn
- every second the game checks how much animals and monsters there are
  - if there are less than 15 monsters around, the game trys to spawn a monster with the propability of (amount of monsters/20)
  - elseif there are less then worldwidth*0.1 of animals, there is a 50% chance to try to spawn an animal
  - then the game searches for good spawning spots for the selected mob type
  - the selected mob will spawn with a chance of (amount of good spots/20)
  - aggressive mobs won't spawn in a 5x5 block square around the player (monsters don't see and follow the player if he's more than 5 blocks away from them)
- aggressive mobs will despawn if they are more than 20 blocks away from him
- mobs will only update (move, take damage etc.) if they are on screen

Any suggestions are welcome!