Authentic NES 8-bit pixel art game, CRT scanline overlay, 240p resolution aesthetic, locked side-scrolling gameplay framing. Holmes and Watson pixel sprites walk from left to right across a Victorian London level — legs cycling in classic 4-frame 8-bit animation, arms swinging in alternating rhythm. Parallax background scrolls: foggy Victorian rooftops and Big Ben silhouette drift slowly leftward at the back layer; a mid-layer of brick building facades scrolls at medium speed; the foreground cobblestone street tiles and flickering gas lamp sprites scroll fastest, creating full NES parallax depth. A pixel-art HUD is fixed at the top of the screen: "SCORE 008400" on the left, three small Holmes-hat life icons in the center, and a segmented health bar on the right in red and grey pixels. At 00:05.000, a top-hat villain enemy sprite emerges from the right edge, walking leftward with a cane — Holmes raises a fist sprite in a punch animation, the enemy flashes white and disappears in a pixel-burst explosion of 8-bit sparks. Flickering torch sprites mounted on lamp posts pulse orange and yellow every other frame. Animated fog sprites drift slowly across the mid-ground in looping tiles. At 00:10.000, a barrel obstacle rolls in from the right — Watson leaps over it with a jump arc animation, landing back on the cobblestones. The score counter at the top ticks upward in pixel digits. The camera remains a perfectly static locked side-scroll frame throughout, everything animated within it.