"Mega Castle Build" は、ブロック建築ゲームの動画向けの、カラフルなボクセル風のYouTubeサムネイルです。緑の縁取りのあるブロック状の白文字が左に積まれ、右では青い屋根と滝のある巨大なドットのお城が夕焼け空の下で光っています。自分の建築物とフックに差し替えて作り直せます。

Create a finished 16:9 YouTube thumbnail at 1824 × 1024 px, designed to read instantly at phone size. Use a vivid voxel pixel-art register throughout: crisp square-pixel edges, chunky block geometry, bright sunset color, clean high contrast. Render only this exact text: “MEGA CASTLE BUILD”. Set it as the sole headline, stacked across three lines on the left half, in huge custom block-built capitals: thick uniform strokes, squared corners, compact spacing, solid white faces, a broad saturated green outline, and a short dark pixel shadow for separation. Keep every letter fully inside the safe margins. On the right, show a gigantic, unmistakable voxel castle built from colorful square blocks, with tall towers, crenellated walls, a central gate, and small glowing window pixels. Place a large orange-pink pixel sun behind the towers; use a saturated sunset sky transitioning from golden yellow to coral and violet, with a few square cloud clusters. Add subtle pixel-scale ground blocks at the bottom. Keep the text readable against a darker patch of sky, with the castle as the dominant scene prop. Preserve a clear, low-detail area in the bottom-right corner for YouTube’s video-length overlay; put no words, faces, or important castle details there. No extra text, logos, channel name, play button, interface graphics, timestamp, or progress bar. Sharp pixel edges, rich saturated color, strong separation between foreground and sky.