Infinite Book Shelf – Built on Sai Server

Where to play

One game, four stores

The same game and the same cloud saves, in the browser, on PC and on Android.

Gameplay

Never run out of books.

Infinite Book Shelf uses two Sai Server modules for sign-in and cloud saves. Here is what each one does in the game.

SaiAuth: Google sign-in through the backend, token sessions with auto refresh, and auto-login on return. A session guard sends the player back to login safely when the refresh token expires.
GamerProgresscustom game_data: The whole level is stored in the cloud: the seed, the position of every moved book, the tray contents and the Fuzzy Fruit count.
Smart auto-save: A cheap fingerprint of the level is checked on an interval. The game saves only when data changed, after it settles, with a maximum delay cap. It also force-saves on logout or exit, and saves to the device on mobile. Few requests, no lost progress.
Seed-based restore: A saved level is rebuilt deterministically from its seed and only the differences are applied, so saves stay small.
Release-safe config: Release builds take the GAME_ID from build config, strip dev credentials and allow only Google sign-in. Dev builds keep the debug login and debug info.
Web store on Sai Play: The game's shop also opens on Sai Play, the player site shared by every game on Sai Server. Players sign in with the same account and buy in the browser; purchases arrive in the game's mailbox or inventory.Open the shop on Sai Play

Not used by this game. One drop-in prefab, modular and event-driven.

Engineering highlights

4,177 → 55draw callswith 4,000 books on screen: GPU instancing and one shared 4K cover atlas.
35.1 MB → 22.4 MBtexture memoryabout 36% less.
~245 ms → ~19 msbook picking batch1,514 rays, zero mismatches.
588 / 28books / shelvesin a normal view, with 100% pool reuse: 84/84 objects, no runtime GameObject allocation.

Endless-feeling levels
A grid of shelves is split into clusters. Shelves are generated only when the camera needs them and streamed in and out as you pan.
Procedural shelves
Each shelf is built from rules: rows of 10 books, compartments of 2–7, stepped boards and one empty compartment. The rules are validated over 20,000 seeds.
Cross-shelf shuffle
Books swap between shelves inside a cluster, fully reproducible from the seed.
Startup work budget
Loading is spread across frames, so the game never freezes while a level loads, on any platform.
Per-platform rendering
Desktop and mobile feature profiles: a mobile render pipeline asset, BC7 textures on desktop and ASTC on mobile.
Pooling everywhere
Books, shelves, flowers and effects come from one scene-authored pool.