You have to remember a way, which is marked with grey or black fields for 5 seconds. After that, you have to control your "block" through the fields the same way. Read more about The Way v1.01 (PSP Lua Game)
Here is an attempt to bring Google Maps to the PSP with a simple interface. This program is not using the Google Maps API (except for address search), it is retrieving the images directly. Read more about PSP-Maps v1.4 (PSP Application)