This is a tunnel game by DJ Omnimaga for the HP 39gII calculator. To play the game on a calculator, just use one of the following methods:

METHOD 1:
-Create an empty program on your calculator, then connect it to the computer. 
-Open the connectivity kit software from HP then select that program.
-Open tunnel39gII.txt in Wordpad or something else then copy its content inside the code window in the connectivity software, then save. This should copy the entire code into your calculator.
-NOTE: Saving might not work if the emulator isn't open. Download the latest version of the HP 39gII emulator at http://www.hp.com/sbso/product/calculators-emulators/graphic-calculator-emulators.html then when saving, make sure that it is open. If the program is saved there instead of the calc, just click send there and this will copy the result on the machine.

METHOD 2 (might crash the calculator! Remove all batteries if this happens):
-Copy tunnl.hpprgm in C:\Users\<username>\AppData\Roaming\HP39gII (Windows 7 path for emulator files)
-After starting the emulator, connect the calculator via USB to the computer.
-From the emulator program menu, send the program to the calculator.

METHOD 3:
-Simply copy the code by hand on the calculator.

This is a tunnel clone for the HP 39gII. To play, run the program and avoid walls with UP and DOWN. Exit with ON. Make sure you got fresh batteries to ensure faster speed.

If the speed gets too slow as you run the program (it should normally run at around 10 FPS for optimal gameplay), exit, then hold down the ON key then press F4 before releasing it. Make sure that USB is disconnected prior playing! From there select option 2:Power, then 1:Full, then quit by pressing ON twice. Repeat this process everytime your calc slows down. Note that this might drain batteries faster (this HP calculator changes the CPU speed as batteries get lower). The other solution is to get fresh batteries but the game might become very hard.

http://codewalr.us/