Tomb Of Syrinx is a sub-Jet Set Willy game in which you are trapped in the aforementioned tomb, and have to find the five keys of Syrinx in order to escape. You've got a laser to kill the Guardians (a load of blocky little sprites) with, and you move around the maze simply by moving up/down, left/right, without even the blessing of a jump button to liven things up.
The graphics are state-of-the-art circa 1983, and the maze scrolls jerkily as you move from one room to another. There's a bit of 'House' music included on the tape, and the game crashed ninety seconds into my second game so I had to reload and start all over again.