To make a PJSK-style gacha in Roblox, you usually build a summon UI, add a currency system, define banner pools, and script weighted random pulls with pity or guarantee tracking. Roblox tutorials and dev forum posts on gacha systems and banner logic show this is the standard structure for a working setup.

Core setup

  1. Create a summon menu with buttons for single pull and 10-pull.
  2. Store player currency, like gems or tickets, in a server-side data system.
  3. Make banner tables for limited, permanent, and event pools.
  4. Use weighted odds so rarities like 3-star, 4-star, or special cards are less common.
  5. Add pity counters so players get a guaranteed rare pull after enough attempts.

Roblox scripting flow

A common Roblox approach is to keep the actual pull result on the server, then send only the final result to the UI. That helps prevent exploit abuse and keeps odds consistent.

A simple logic flow looks like this:

  • Player clicks pull.
  • Server checks if they have enough currency.
  • Server selects an item from the banner pool using weighted randomness.
  • Server updates pity and duplicates.
  • Client plays the animation and shows the result.

PJSK-style details

If you want it to feel like Project Sekai, add banner-specific visuals, character-card reveals, rarity animations, and event-limited pools. You can also include exchange points, duplicate conversion, and a featured-card bonus so the system feels closer to a real gacha game.

Good practices

  • Keep odds visible to players.
  • Separate UI code from pull logic.
  • Save pity and currency after each pull.
  • Test with small sample pools before adding many characters.
  • Make limited banners expire cleanly so old event cards do not stay featured forever.

Simple example

A basic version can start with:

  • 1 common pool.
  • 1 rare pool.
  • 1 featured card pool.
  • 1 pity counter at 100 pulls.
  • 1 exchange shop for duplicates.

That is enough to create a functional PJSK-like gacha loop before adding polish like animations and sound.

Important note

If you mean making a Roblox game that uses Project Sekai characters, names, or assets, be careful with copyright and IP rules. A safer route is to make an original rhythm-game-inspired gacha with your own characters and art.

TL;DR

Build a summon UI, server-side weighted pull system, currency check, banner pools, and pity tracking, then add PJSK-style reveal animations and exchange rewards for duplicates.