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<p>The game was originally released on the <a data-ref-id="3045-24" href="/atari-8-bit/3045-24/">Atari</a> 400/800, but the game was since ported to the <a data-ref-id="3045-14" href="/commodore-64/3045-14/">Commodore 64</a>, <a data-ref-id="3045-94" href="/pc/3045-94/">IBM</a> PCs, and even the <a data-ref-id="3045-57" href="/game-boy-color/3045-57/">Game Boy Color</a>.</p><p>The original version of Shamus contained 128 levels, in which the player (a robot detective named Shamus) navigated a maze with electric walls, avoiding and shooting enemies, collecting items, and eventually reaching “The Shadow’s Lair.”</p><p>Again, similar to the gameplay in <a data-ref-id="3025-58" href="/berzerk/3025-58/">Berzerk</a>, the player is penalized for standing too long in one spot. If the player decides to linger in a room too long, the “Shadow” appears and attacks the player, usually killing him.</p>