You will need a copy Unity3d you can get it for free. Then after you download it open a new project. Then import the modtoolspackage, then in the Hiearchy click create/3dobject/terrain. This will create a new piece of terrain. Now there are five brushes. The raise hight, first button, paint hight second button, paint tool third button, trees button fourth button and grass tool fith button. In the inspector go to the paint tool. Then select edit textures/ add texture you will problably want to draw some textures, or import the enviorment package, *Assets/importpackage/envirorment. Or just use a painting program and draw a texture. So after you click add texture the whole terrain will be painted that texture. You can add more textures and then paint the terrain by selecting a different texture from the box. now the raise hight raises the hight. just click on raise height and the hieght will raise. And the gear you can change the terrain size. Now you need to go to the SimplePlanes icon at the top of the screen. Click on map/mapobject. Now make the terrain a child of the mapobject by simply draging the terrain over the mapobject and dropping it. Now at the top left corner of the screen click arrows and if you click the terrain you can move it. Also if you get a block create/3d object/cube you can push the squares also in the topleft corner of the screen and or click on the block and change the scale values, and the cube will get biggerbut if you drag the squares on the thing I told you about on the top left corner of the screen it will change size. Now the paint hieght tool lets you paint to a specific hieght, YOU MIGHT WANT TO LOWER THE TERRAIN OR ELSE IT MIGHT LOOK WEIRD use the terrain hight tool and and add to the negetive Y value it would look somthing like this Y -200 then put the value next to the flatten button it would be somthing like this Y 201 then start painting the terrain. You can make the brush bigger by sliding the brushsize up. It will take longer the lower your terrain is. The tree brush is nice for placing trees. note IT IS HIGHLY RECOMEDED THAT YOU IMPORT THE ENVIORMENT PACKAGE FOR TREES, THE SAME FOR GRASS TEXTURES. The grass button simply get your grass texture and use the brush and paint the ground with grass. Now you might want to get a plane in the 3d objects and make sure the y is at Y = 0 and make the plane suuuuuper big. That will tell you about the water level, you might also want to go into project/create/material call it whatever you want drag it on your plane and and make it blue in the inspector. Go to the SimplePlanes button again and click mod builder window. There you can drag it somewhere to dock it and now you can edit the mod name, version number, give it a description, and go to the hiearchy click on you mapobject and then save selected scene objects. Now when you mod is finsish and you have saved the selected scene objects, click save mod, then go into *C/Users/YourPCusername/Appdata/Jundroo/SimplePlanes/mods, and save the mod. **YOU WILL WANT TO GO INTO WINDOW/LIGHTING AND DISABLE THE AUTO BUILD BEFORE YOU SAVE IT! Well that is the basics for terrain editing, but here are some unity tips. Mouse middle button and drag the mouse will drag the camera. Right click drag the mouse will rotate the camera. If you have any issues then let me know.