Move your mouse to steer your ship. The ship will turn in the direction of the mousepointer. Keep your pointer close to the centre for a small turn, and close to the edge for a larger turn. When the enemy ship is in the centre of your viewfinder, click anywhere (or press the space bar) to fire your weapons. Click on the speaker in the bottom left-hand corner to turn off the audio clips. The enemy ships will try to escape. If 10 manage to escape then the game will end.
This games is based on my "Star Wars - Tie Fighter" game but uses Star Trek TOS ships and audio clips. This "S2" version uses the cloning feature in Scratch 2 to create more stars than the original