Jared and the Subway adventure is a Qbasic game I programmed 2001. You can download the exe file here. Extract the contents and run the exe file.
It actually is possible to beat every level. Here's a tip: In some levels you have to press the arrow keys really fast to get over the water.
I recommend you run it in 640x480 mode.
Controls:
left - move left/turn left
right - move right/turn right
up - jump/up ladder
down - down ladder
space - pick up/drop blocks
Runs on windows. Tested on Windows 7 - probably works on every other version too.