
Calf Ridges
Muscle bulges open and close the route on the stride. Learn the song here.

Titan Spine is a climbing game with one boss and one mountain: a continent-sized titan wading through a war, and you climbing it. Handholds shift as its muscles flex, parasites defend their host, and the horizon heaves with every stride. The first two regions are free to climb in your browser and on your phone; the rest of the mountain is one purchase.
Aun is a titan: a piece of land that stood up and walked. Villages cling to its plateaus, and the river kingdoms below fight their war in its wake and call it the Calamity. Every titan before it lay down in the Sleeping Range to become a mountain again. Aun is the last one walking, two centuries overdue.
You are Sela, seventeen, a Linekeeper’s daughter from Cleft Village on the Hip Plateaus. Since the war began you hear a whisper from the skull on every heartbeat: the same voice that drew the village founder up to the crown, never to come down, and that broke the Rider who climbs ahead of you. Climb camp to camp, hold on through every footfall, and find out what a grieving mountain is asking for.
“It has been calling for two hundred years. You are the first to answer.”

Muscle bulges open and close the route on the stride. Learn the song here.

Inside the joint, tendons tense and slack like ropes. The whole room shears on the footfall.

The namesake: a ladder of bones that turns with every stride, leylines burning brightest at night.

Free-solo on swaying tendon, the cold and thin air near the crown.

Above the clouds the titan turns its head, and for the first time, it looks at you.
The web sells nothing the phone does not sell. Prices are the ones Stripe and the stores show you before you pay. Unlock once and it is yours in both places.
| Free, everywhere | Paid, everywhere |
|---|---|
| Regions 1–2: the Heel and the Shin, their camps and parasites | Regions 3–6 and every base season region as released (`full_ascent`) |
| Photo mode, the journal, the route map | Season expedition packs: cloaks, camp décor, loadout slots |
| Weather, stride, the background war | Cosmetic cloaks, the Carver's Kit, Doria's Light-Box frames |
| Supporter Pack and Founder Upgrade |
A vertical platformer where the wall is alive. Tap a handhold to reach, hold to grip through the stride shock, swipe to leap. The titan breathes and walks; the handholds move with its muscles and the background war scrolls past at its height.
Built for one hand in portrait. Expeditions of ten to twenty minutes from camp to camp. Fall and you drop to your last piton, never losing what you found. On the phone that is one thumb; in the browser, a mouse or a touchscreen.
The same climb on a big screen. The web edition runs the same engine in your browser, so a laptop or desktop gets the full-height titan with no install. Photo mode frames the vista; the save moves to the phone with one scan.
Six regions today, the skull to come. Heel, Shin, Knee Cathedral, Thigh, Hip and Ribs are built. Seasons add the Shoulder, Neck and Skull Crown. Full Ascent is one purchase for every base region as it releases.
In the app, tap the devices icon on the home screen, then Play in your browser, and scan the code the web game shows. Your progress comes across and the browser owns what your phone owns.
Buy in the browser's shop after signing in. Scan once from your phone and the purchase is on your phone as well, for good.
Open the web gameA new browser? Scan from your phone again, or sign in with the same Google account. No codes to keep.
A vertical platformer about climbing: you reach, grip and leap up the body of a walking titan. There is no combat loop, no energy and no ads inside a climb.
Yes. The Heel and the Shin, with their camps and parasites, are free in the browser and on the phone. Regions 3–6 and every later base region are one purchase, Full Ascent.
It is built for one hand in portrait, with ten to twenty minute expeditions and falls that never cost content. Try the free regions and decide.
The web edition runs in any modern browser on a laptop or desktop, full height, no install. Your save moves to the phone with one scan.
Yes. Open the app, choose Play in your browser in Settings and scan the code on this site. Your route, your journal and your purchases come across.
Sign in with Google before you pay, then scan the code from your phone once; the purchase is on your phone for good.
Six regions are built, from the Heel to the Ribs. Seasons add the Shoulder, Neck and Skull Crown, and Full Ascent covers every base region as it releases.