I just quickly checked on Google Play: Pixelcraft looks like a copy of Pixture. Pixture is a beautiful game for Minetest and it can be taken from here:
viewtopic.php?t=13181I don't know why Pixelcraft and Multicraft/Multicraft2 are considered “illegal”, but my guess is that not full credit is given or source code is not shared or another GPL violation. But I really don't know it so don't take my word for granted.
2. I created a server on my android phone, and connected with my other phone. I notice that the server have fly abilities & creative inventory. Is this normal that the server user has all this power?
OK, more detailed explanation than above:
Flying is a privilege which can be granted by the server on a per-player basis. Check your privileges by typing /privs in chat. :D If “fly” is in the list, you can use fly mode. You can also check the privileges of another player by saying “/privs <playername>”.
Since the server operators have the power to change and grant privileges at will, they can logically grant themselves flying.
See also:
http://wiki.minetest.net/PrivilegesCreative Mode is a server setting which is either completely enabled or completely disabled. In Minetest, Creative Mode is a really odd thing, technically. Its meaning largely depends on the game, but in practice it means you have the creative inventory, fast dig times, tools don't wear out, etc. Focus is on creativity rather than survival.
But if the server uses Unified Inventory (the fancy gray inventory screen with lots of buttons and a huge crafting guide), then the creative inventory can also be granted on a privilege basis.
3. If I dig some dirt, the dirt above collapse, etc. If I try to build a house out of dirt, then it all collapse. This is good in that it's realistic, but I swore I played another minecraft and this wasn't the case (in other minecraft the dirt do not collapse down). Is this default setting in minetest - and can we change this setting?)
The answer from the previous user is not really correct. Whether dirt collapses or not (or even if there is dirt at all) depends on the game being used. With Minetest, both are possible: Either dirt can collapse or it can't. It depends on the game. In Minetest Game, the default game for Minetest, dirt does NOT collapse. I am not aware of any game for Minetest in which dirt collapses, but it is totally possible.
It is not a configuration setting, however; unless the game chooses to add one (very unlikey as this setting is absurdly specific). You need to change Lua source code.
Note that if you play on servers, the gameplay de facto varies per server. This is because every server can just modify the games and mods at will (including making dirt collapsible), and everything will still work out of the box for online players. I think this is one of the coolest features of Minetest! :-)
PS: Useful reading:
http://wiki.minetest.net/Minetesthttp://wiki.minetest.net/Subgames/Minetest_Gamehttp://wiki.minetest.net/Dirthttp://wiki.minetest.net/Blocks (note that all block pages in the wiki refer to an UNMODIFIED Minetest Game installation)
http://wiki.minetest.net/Server