Welcome! I made a new game in Minecraft. It's called Tower Defense or MineTower.
I am not from your country, so i don't write very much about this game... Sorry about this. I used command blocks for this map.
So in this map you must defense the tower before mobs kill us. On start command block gives 3 lvl, and this is your hearts. But if zombie go to our tower, you lose 1lvl (1 heart). On start you get a bow, armor and food. If you win the wave of mobs, you get 1 heart.
If you lose all your hearts, command block teleports you to spawn.
You can also turn on hardcore waves! I think it's very hard to survive.
Good luck!
No mods! More games i try to make later... And YOU! Send me a idea for new game in Minecraft! :D