Stargate is a short, free browser puzzle and exploration game. You stand in the gate room in front of a ring of 24 glyphs, and your job is to dial a seven-symbol address to open the gate.
Rotate the ring with ← and → (or click and drag) until the glyph you want sits under the top chevron, then press Space to lock it in. Lock all seven chevrons with the right address and the event horizon forms. Step through to arrive on another world.
On the other side, explore with W A S D or the arrow keys, find the landmark and press E to interact with it. When you're done, walk back to the gate and press E to dial home. Press R in the gate room to reset the ring.
It's built with Canvas 2D and plain JavaScript and runs entirely in your browser, with nothing to install.