# Hello BT21 — bubble-shooting puzzle game!

> Match-3 bubble shooter puzzle game featuring BT21 characters and a story mode. (iPhone/iPad app by Kakao Games Corp..)

- Source: https://appshunter.io/ios/app/hello-bt21/id1515454350 (this page in markdown: same URL + `.md`)
- Developer: [Kakao Games Corp.](https://appshunter.io/developer/1002306740)
- Category: Games, Entertainment
- Price: Free
- Rating: 4.82/5 from 1,350 App Store ratings · 54 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 249 MB
- Languages: English, Korean
- Released: 2020-08-17
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hello-bt21/id1515454350/reviews.md

## What is Hello BT21?

Boom-! DYNAMITE the bubbles with BT21!
* Come check out THE MOST LEGIT BLASTING MATCH-3 PUZZLE GAME! *

1) STORY
Season 2: BT21's Operation - Popomon Mega Clean Up!
The BT21 members have been trying their utmost best to achieve Universtardom!
But one unlucky day, a bunch of interfering, no-good dandelions, Popomons, showed up out of nowhere and thwarted their efforts!
Are the BT21 members going to be able to clean up the Town properly after their good work was messed up by the Popomons and make their debut as Universtars?

2) GAME FEATURES
[Stages]
- There are different stages in the game with a variety of challenge obstacles including Milk, Boxes, Ice, and Slimes which all add to the overall fun and excitement of play!
- Ultra easy to play! Playable one-handed, with the ability to fling bubbles at a touch is super refreshing!
- The endearing BT21 characters have special skills of their own that will help you clear each stage and progress through the game!

[Story Missions]
- Clear stages and collect the sought-after Story Keys!
- Clear the Story Missions with the Story Keys you've collected and then get cracking on cleaning up the Town!
- Clear all the Story Missions for each Chapter and you'll be the lucky recipient of some awesome gifts!

[Town]
- Find and tap a chatty friend from the forest LEAF in Town to get a special BT21 illustration!
- Clear Story Missions and then create your own wonderful Town!

3) HOW TO PLAY
- Throw bubbles and line up 3 of the same type to pop them! It's that easy!
- Match at least 4 of them to make potent explosives bubbles that match that type of bubble! Blast away for even more fun!
- If you're able to successfully complete your mission by the time you run out of bubbles, you'll have cleared that stage and then be ready to move onto the next one!
- Use lots of explosive bubbles and your Rainbow Ball gauge will soon fill up to the top and, once it's full, you'll be able to make a spectacular Rainbow Ball that uses its power to let you destroy all the bubbles of a type of your choice in one fell swoop!
- If you can make lots of Rainbow Balls, then victory is virtually guaranteed to be yours! Aim well with your bubbles to create the potent explosive bubbles and go for those powerful Rainbow Balls! Rainbow Balls ramp up the excitement to the max!

4) WHAT IS BT21
BT21 is a beloved group of cutesy characters much adored around the world that were originally created from the LINE FRIENDS! Their LINE stickers are also a massive hit!
Each of the 8 cutesy characters of KOYA, RJ, SHOOKY, MANG, CHIMMY, TATA, COOKY, VAN have their own distinctive characters and personality traits. When they all get together, they form the amazing BT21!

5) RECOMMENDED TO
- Anyone who loves BT21!
- People who enjoy being excited by fantastic puzzle games!
- People who enjoy playing stimulating LINE games!
- People who enjoy honing their skills in shooting puzzle games!
- People who are searching for engaging puzzle games that you can keep playing for free!
- People who want to use their spare time with a fun and easy-to-play puzzle that they'll love!
- People who like games that have a townscape, packed with houses, gardens, etc. that you can build, maintain and personalize to make them your very own!
- People who want to play a simple and easy-to-play shooting puzzle game!

Enjoy Hello BT21 together with your family and friends!

## Key features

- Match-3 bubble shooting gameplay
- Challenging stages with obstacles
- BT21 character special skills
- Story missions and key collection
- Town building and decoration
- Explosive power-ups and Rainbow Balls

## What do users think of Hello BT21?

Overall sentiment: mixed

**Pros**

- ❤️ Cute and adorable BT21 characters
- 🎮 Fun and entertaining gameplay
- 💜 Loyal and supportive ARMY fanbase

**Cons**

- 🐛 Frequent crashes and stability issues
- ⌛ Slow loading times and performance problems
- 🔍 Lack of language options and translation

**Commonly reported bugs**

- Game data loss and account resets
- Inability to log in with existing accounts
- Constant errors and crashes

**Most requested features**

- Add language options and translations
- Improve stability and reduce crashes
- Optimize loading times and performance

## Recent user reviews (10 of 54)

All indexed reviews: https://appshunter.io/ios/app/hello-bt21/id1515454350/reviews.md

### 3/5 — I love it BUT…

*2023-09-08*

I truly love this game. It’s entertaining to pass time and BT21 friends are absolutely adorable. My only issue and it’s a big one is that after a week it ALWAYS crashes and won’t launch. I’ve removed and downloaded 3x now and don’t think I’d do it a 4th time as much as I love it. Hopefully this gets fixed 💜

### 5/5 — Joonie Tube

*2023-08-26*

Hello Army or Universtar ! I just wanna write this review to say that I really appreciate your effort into this game and I really love it. I see no problems at all. I like it that some levels are hard and the way the BT21 member’s dialogues and their designs , also their style is really cute and just makes me want to burst in tears. T-T I really love this game and I don’t want this game to be deleted. I also love the fact that you also have a story mode and some locations even BT21 IN COSTUMES OR AT21 !! I SUPER SUPER DUPER LOVE THIS GAME !! These are not opinions and just true facts that this game is really cute >.< , I even love the events. Hope to see some more upcoming events and love this game. Peace out ✌️

											- Love , Joonie Tube 🧡

### 5/5 — Waiting…

*2023-06-15*

Please REMOVE the opening scene. I don’t want to wait 30 seconds every time I try to play the game 🙃

### 2/5 — Cute game BUT Glitches

*2023-05-06*

I love everything BT21. This game has cut animation and overall is fun and adorable. BUT after about two days of playing, the app glitched and wont even load! I cant get past the “Kakao” screen, that comes up then the app just blanks out and sends me to my phone’s home screen. Please fix!!!!

### 3/5 — Will not open ):

*2023-04-18*

Have to delete and redownload every time I want to play because the app just won’t open ): this has been happening since the latest bug fix !!

### 4/5 — Game overall

*2022-10-20, version 1.4.0*

Hello, I recently downloaded this game and so far I LOVE it ❤️❤️❤️If only I had the option I would have given it a 4.5 star review; however, I noticed that there is some English mistakes when starting a phrase. Hope you can fix it ! Thank you for this!

### 1/5 — Stopped Working

*2022-09-19, version 1.4.0*

I loves this game and now it won’t start. Just keeps spinning circle in the beginning with the characters and it’s impossible to get support, I’m in the US.

### 5/5 — Fun Perfect game for army

*2022-06-28, version 1.4.0*

I love this game it has the game that I play nonstop and it’s super fun and addictive the graphics amazing being able to play your favorite BT 21 characters it is blast great super fun a perfect game to play if you’re army you’ll love this game I know I do

### 5/5 — Army💜

*2022-06-09, version 1.4.0*

Love this game so much. Army here to support anything with BTS in in 😅

### 4/5 — Help pls

*2022-06-08, version 1.4.0*

Love the game, so addicting and so cute but lately, the game just won’t load and when it does I takes forever. Is it just me? Can anyone shed some insight how I can fix this pls? Thank you

## Frequently asked questions about Hello BT21

### What is Hello BT21?

Hello BT21 is a match-3 bubble-shooting puzzle game. Players aim to pop bubbles by matching three or more of the same color. The game features a story mode where players help BT21 characters clean up a town and achieve their Universtar dreams.

### What are the main features of Hello BT21?

Key features include diverse stages with unique obstacles like milk, boxes, and ice. Each BT21 character possesses special skills to aid in clearing levels. Players collect Story Keys to unlock Story Missions and can rebuild and decorate their own Town.

### How do I play Hello BT21?

To play, throw bubbles and line up at least three of the same type to pop them. Matching four or more creates explosive bubbles. Completing missions before running out of bubbles clears a stage. Filling the Rainbow Ball gauge allows for powerful area-clearing attacks.

### Is Hello BT21 free to play?

Yes, the application is free to download and play. The description indicates it is a free game without mentioning in-app purchases or advertisements.

### Who are the BT21 characters?

BT21 is a group of characters created by LINE FRIENDS, consisting of KOYA, RJ, SHOOKY, MANG, CHIMMY, TATA, COOKY, and VAN. Each character has a distinct personality and special skills that can be utilized within the game.

## Version history (last 2 releases)

### 1.5.0 — 2023-03-31

game bug fix

### 1.4.0 — 2022-04-04

game bug fix

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All apps by Kakao Games Corp.: https://appshunter.io/developer/1002306740

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*