Cascade

The areas under them will be turned into gold; turn the entire level to gold (by creating matches over every square, including the corners) to complete it and receive a bonus for any remaining time.

Matches cause all tiles above those removed to drop down, with new tiles added in their places at the top.

This can create chain-reaction combos of new lines, which are also removed and scored.

You also have the use of Suns, which can remove a particular square and make it gold - with a fresh compliment of six after every five levels.

There are locked tiles which must be removed by a match before they can be moved - these open up new spaces below them - and cobwebs which are turned into blocks when a match is made over them.

Bonus tiles also exist, which are activated by making matches with them.

Some remove the entire row, column or both, or a square of blocks around the tile.

Others remove all tiles of that colour, or stop the clock for 15 seconds.

Every five levels there is a bonus level - open five tiles at random for bonuses such as points and suns.

Cascade for Sega Genesis is currently worth €27.76 loose, €35.55 complete in box. Prices are based on real sales and update regularly on Gamevaro.

Cascade 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 Cascade, loose is €27.76 and CIB is €35.55 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.