Sentinel 10 by Sharpworks

"Sentinel 10" by Sharpworks
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Written in BASIC for the 2021 BASIC 10Liner Contest.
Category "PUR-80"
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Program a game in 10 lines (max 80 characters per logical line, abbreviations
are allowed).
Attention: In this category only factory built-in BASIC variants are allowed
How to Start the Game
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Sentinel 10 is a game for the Sharp MZ-80A 8-bit computer. You can use the
enclosed emulator to play the game but it should work on any MZ-80A emulator.
To get the latest version of the Emu-Z emulator please visit here:
http://takeda-toshiya.my.coocan.jp/mz80k/index.html
You may get a warning from Windows Defender regarding the emulator but it is
fine and should be given permission to run.
I have made a YouTube video showing how to launch the emulator and then load
the game, this can be found here:
https://youtu.be/bbtyNBsO3PA
The MZ-80A was marketed as a 'clean computer', meaning that there is no
programming language already in memory when the computer is switched on.
However, one of the tapes packaged with the machine was the SA-5510
BASIC interpreter. Therefore this is the default BASIC provided with
the MZ-80A and is the one used for my game.
Game Description
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Having infiltrated the aliens' base and avoided all their defenses and
robot army you are down to your very last piece of energy and find yourself
facing the Final Sentinel robot. Your mission was to seek and disable all the
Sentinel robots in the base and this is the last one.
You start at one end of the final room (the left side) and the Final Sentinel
is placed at the other end. The problem is, if the Sentinel sees you it will
shoot you and you will lose your only energy. It can only see in a straight
line however and you are provided with a random set of walls to hide behind.
You must make your way towards the Sentinel without it seeing you (by using
the walls to hide behind) and disable it. The only way to disable it is by
standing directly on the space in front of it.
To control your player please use the numeric keypad:
            UP
            _
           |8|
            -
     _      |      _
LEFT|4|---- | ----|6|RIGHT
     -      |      -
            _
           |2|
            -
           DOWN
The game will only end if you're shot or if you disable the Final Sentinel.
If the game ends and your energy is 0 then you were shot and you lost.
If the game ends and your energy is 1 then you have successfully disabled the
Final Sentinel :)
Have fun!