Titan

Professor Hybrys’ variant is called Titan and involves a ball, a control unit and 80 labyrinths.

Your objective is either to destroy all destructible blocks in each level by hitting them with the sphere, or to pilot it to the exit.

The black ball is beyond your control; it will bounce straight or diagonally through the labyrinth with constant speed.

You move the control unit, a small box, which you are to position in a way that the ball bounces off it in the desired direction.

You can also catch the sphere by quickly moving over it, and then release it in a direction of your choice.

The labyrinths not only contain harmless, destructible blocks, but also increasingly difficult hazards.

If the sphere or your control unit hit a skull symbol, one of your nine lives is lost.

Teleporters exchange the position of you and the ball, wall pieces can be pushed around or destroyed by your unit, and floor tiles will grow into walls when you pass over them too often.

The high game speed can be slowed down by holding the space key – a very useful option in tricky situations.

Titan mixes an arcade game foundation (requiring quick reflexes and good nerves) with puzzle game elements (requiring logical thinking to beat the complex levels).

The challenge is to control the sphere accurately, yet indirectly.

Titan for Nintendo Entertainment System is currently worth €22.34 loose, €21.45 complete in box, and €69.09 factory sealed. Prices are based on real sales and update regularly on Gamevaro.

Titan has a steady sales history on the tracked marketplaces, meaning it trades hands regularly and isn't considered particularly rare.

Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For Titan, loose is €22.34 and CIB is €21.45 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.