{"rewrite":{"id":"r_1d2f5a9361081ffdea9dc970","clusterId":"c_81d4b7c72fc8491319e689ba","slug":"mainline-launches-on-steam-as-a-four-second-roguelike-fps-inside-the-bloodstream","model":"deepseek-v4-flash","headline":"MAINLINE Launches on Steam as a Four-Second Roguelike FPS Inside the Bloodstream","summary":"Indie developer Bakuebo released MAINLINE on Steam on September 14, 2026. The game casts the player as caffeine injected into the human body, with a four-second survival window inside the blood vessels that is restored by defeating enemies. Speed rises with each kill. Clearing a stage grants one of three upgrades, carried forward across six chapters that run from the peripheral veins to the brain. EX1, EX2, and an endless stage with Steam rankings are also included.","whyItMatters":"The game's whole design hangs on a timer the player cannot see, which makes the no-gauge, heartbeat-and-darkening-vision feedback loop the actual product rather than a stylistic flourish.","webCardHtml":"\u003cp\u003eThe six chapters run peripheral veins, heart, lungs, aorta, blood-brain barrier, brain, and the colors and scenery inside the vessels change as you move through them. Taking damage cuts the timer further, and consecutive kills intensify both speed and the on-screen effects. The speedometer reads in nanometers, since the setting is the inside of a human body rather than a road.\u003c/p\u003e\u003cp\u003eUpgrades to ammo capacity, firepower, rate of fire, and reloading carry over even if you switch weapons. The game is on PC via Steam at 300 yen, discounted to 255 yen through September 28. Bakuebo warns that both the game and its promotional video contain intense flashing effects.\u003c/p\u003e","blueskyPost":"MAINLINE ties its only healing to kills, so a four-second window is also the timer for finding the next enemy. Speed climbs with each one, which turns survival into an accelerating problem.","twitterPost":"MAINLINE restores the four-second window only by killing, so each fight buys the time to reach the next one.","threadsPost":"MAINLINE's four-second survival window is restored by defeating enemies, so every kill doubles as the timer for the next one. Speed rises with each kill, and the run carries upgrades across six chapters from the peripheral veins to the brain.","newsletterBlurb":"Bakuebo's MAINLINE arrived on Steam on September 14, casting the player as caffeine traveling the bloodstream on a four-second survival timer that only enemy kills can extend. Speed climbs with each kill and the visuals intensify with consecutive ones, while upgrades chosen at each stage clear carry forward across six chapters ending at the brain. The game is 300 yen, discounted to 255 yen through September 28, and carries a flashing-lights warning.","attributionJson":"[{\"source\":\"Game Spark\",\"url\":\"http://www.gamespark.jp/article/2026/09/14/172248.html\",\"title\":\"Psychedelic Super-Fast Roguelike FPS 'MAINLINE' Launches on Steam, Where You Play as Caffeine Traveling Through Blood Vessels Toward the 'Brain' Through Colorful Spaces\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":4672,"outputTokens":667,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1789388073,"createdAt":"2026-09-14T12:10:01.000Z","publishedAt":"2026-09-14T12:13:24.000Z","updatedAt":"2026-09-14T12:13:24.000Z"},"cluster":{"id":"c_81d4b7c72fc8491319e689ba","canonicalTitle":"プレイヤーはカフェイン―血管内を行き交い、色とりどりの空間を進んで“脳”を目指すサイケな超高速ローグライクFPS『MAINLINE』Steam配信開始","representativeArticleId":"a_7ca4c6c00fc338a10c2f5fce","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"MAINLINE\"],\"studios\":[],\"people\":[],\"type\":\"release\",\"domain\":\"games\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-09-14T11:15:03.000Z","lastSeenAt":"2026-09-14T11:15:03.000Z","updatedAt":"2026-09-14T12:13:20.000Z"},"attribution":[{"source":"Game Spark","url":"http://www.gamespark.jp/article/2026/09/14/172248.html","title":"プレイヤーはカフェイン―血管内を行き交い、色とりどりの空間を進んで“脳”を目指すサイケな超高速ローグライクFPS『MAINLINE』Steam配信開始"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["MAINLINE"],"studios":[],"people":[],"type":"release","domain":"games","is_roundup":false},"keyFacts":null}