Sandbox turns out to be a very capable and relatively easy to use game editor. The interface is remarkably 3dsMax-like. Here is a basic landscape and begun texturing it so far. Heightmap editor has excellent tools to work with rather like Sitni-sati Dreamscape 2. The height brush is especially neat- since it works in the perspective viewport (which incidentally is fully textured with an animated saea surface). Beat that!
It’s built in programming language is LUA– which I’m reliably told -is easy and light.
Make sure, if you get into this that youhave the most recent sandbox manual- the one supplied in the box is terrible.
In short- it’s a fully fledged 3d app, sold as a level editor but cost me only £5.99. It would be good enough to use at school, in some kind of after-school club except for one thing: the game is rather violent.