This game classic is about a diamond chase underground with many obstacles. Try - as Rockford - to collect all required diamonds in altogether 16 caves (A-P) with each 5 difficulty levels, and to always find the exit in the limited given time. Every 4 caves (after cave D, H, L, P) follows a so-called "intermission", which is a logical puzzle (but has no own "cave letter"). Rockford can dig through the ground and push rocks. But these can also get dangerous. If he stands directly below a rock, Rockford can hold it with his head, but if a rock falls on his head, it will cost him a life. The rocks do not stay on each other or on walls, if you dig away the supporting soil, but they will start so slide. Furthermore, there are some animals such as fireflies, amoeba and things that you'd better not touch. Butterflies and other inhabitants of the ground can only be defeated by letting fall rocks on them. They then turn to diamonds, which you can pick up. As soon as the necessary amount of jewels has been collected (the number is shown in the upper bar) , the escape tunnel opens into the next level. Strategy and throughtful planning it the basis to master this game.

Forbidden Forest is a game designed by Paul Norman, published by Cosmi Corporation in 1983 for the Commodore 64 and Atari home computers.[1] In this game the player controls an archer, armed with a bow and a limit of four quivers of arrows per level. The aim is to move through a forest setting while eliminating various monsters, including giant spiders, bees, mutated frogs, dragons, wizards and snakes, with the final enemy being the "Demogorgon". The game has four levels of difficulty which determine the number and speed of the monsters. This is one of the earliest video games to use animated blood.

A sequel, Beyond the Forbidden Forest, was released in 1985. This was billed as "OmniDimension 4D", as it allows the archer to move (and shoot) in and out of the foreground, with scenery changing from day to night in order to represent time passing.Again, the object is to eliminate monsters (giant scorpions, worms and mosquitos etc.) while wandering the forest, earning a golden arrow for each kill; after earning four arrows, the archer may enter the underworld to face bats, a Hydra and finally the Demogorgon itself.

A further sequel, Forbidden Forest (informally, Forbidden Forest 3), was released for the PC in 2003, co-developed with Webfoot Technologies. This is a 3D adventure in which the aim is to explore an environment while searching for coins, collecting power-ups and facing recreations of villains from the first game. The release included the original Commodore 64 games.