Great Giana Sisters, The

In Level 3 there is a row of Blocks. Stand on the last one of tzhe blocks and jump up to hit an invisible Block that will take you to Level 6.

At the end of Level 8 at he spider jump against the breakable Block and after the stone dropped jump there again and you will be taken to Level 11.

Load or reset the game, then execute the following BASIC command before running or restarting the program.