# 21 Blitz > Practice your classic Blackjack skills in a modern version of the card game. Canonical page: [https://chrome-stats.com/d/com.tetherstudios.blitz21practice](https://chrome-stats.com/d/com.tetherstudios.blitz21practice) ## Overview - **ID:** `com.tetherstudios.blitz21practice` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** Tether Studios LLC - **Category:** GAME\_CARD - **Downloads:** 209,588 - **Rating:** 3.71 / 5 (601 ratings) - **Version:** 1.53 - **Last updated:** 2026-08-01 - **First published:** 2021-04-16 - **Publisher country:** US - **Size:** 229 MB - **Data as of:** 2026-09-10 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.tetherstudios.blitz21practice) - **Website:** [http://tetherstudios.com/](http://tetherstudios.com/) - **Privacy policy:** [https://www.tetherstudios.com/privacy](https://www.tetherstudios.com/privacy) ## Description ## Overview 21 Blitz: Single Player uniquely combines the excitement of Blackjack with the classic Solitaire format, offering a quick yet challenging card game experience perfect for casual players and card counting enthusiasts alike. ## Features - Choose from four lanes each turn to build stacks adding up to 21 without busting. - Utilize strategic combos, streak bonuses, and time bonuses to maximize your score. - Use the undo feature to preview cards and reset bust lanes. - Multiple game modes and customizable card backs/backgrounds for personalized play. - Smooth animations and fast loading for seamless gameplay on any device. - Includes detailed "How to Play" guide to enhance your Blackjack skills. Play 21 Blitz: Single Player to enjoy fast, engaging games anytime while challenging yourself to beat your highest scores! ## Rankings - #155,518 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_ADSERVICES_TOPICS` - `android.permission.ACCESS_FINE_LOCATION` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.CAMERA` - `android.permission.FOREGROUND_SERVICE` - `android.permission.GET_ACCOUNTS` - `android.permission.INTERNET` - `android.permission.MANAGE_DOCUMENTS` - `android.permission.MODIFY_AUDIO_SETTINGS` - `android.permission.POST_NOTIFICATIONS` - `android.permission.READ_APP_BADGE` - `android.permission.READ_EXTERNAL_STORAGE` - `android.permission.READ_PHONE_STATE` - `android.permission.RECEIVE_BOOT_COMPLETED` - `android.permission.RECORD_AUDIO` - `android.permission.SYSTEM_ALERT_WINDOW` - `android.permission.VIBRATE` - `android.permission.WAKE_LOCK` - `android.permission.WRITE_EXTERNAL_STORAGE` - `com.anddoes.launcher.permission.UPDATE_COUNT` - `com.android.vending.BILLING` - `com.google.android.c2dm.permission.RECEIVE` - `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE` - `com.google.android.gms.permission.AD_ID` - `com.htc.launcher.permission.READ_SETTINGS` - `com.htc.launcher.permission.UPDATE_SHORTCUT` - `com.huawei.android.launcher.permission.CHANGE_BADGE` - `com.huawei.android.launcher.permission.READ_SETTINGS` - `com.huawei.android.launcher.permission.WRITE_SETTINGS` - `com.huawei.appmarket.service.commondata.permission.GET_COMMON_DATA` - `com.majeur.launcher.permission.UPDATE_BADGE` - `com.oppo.launcher.permission.READ_SETTINGS` - `com.oppo.launcher.permission.WRITE_SETTINGS` - `com.samsung.android.iap.permission.BILLING` - `com.samsung.android.mapsagent.permission.READ_APP_INFO` - `com.sec.android.provider.badge.permission.READ` - `com.sec.android.provider.badge.permission.WRITE` - `com.sonyericsson.home.permission.BROADCAST_BADGE` - `com.sonymobile.home.permission.PROVIDER_INSERT_BADGE` - `com.tetherstudios.blitz21practice.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` - `me.everything.badger.permission.BADGE_COUNT_READ` - `me.everything.badger.permission.BADGE_COUNT_WRITE` ## Review summary 21 Blitz: Single Player offers fast-paced and enjoyable gameplay with multiple modes and the chance to win money. However, users frequently report issues such as limited play due to energy constraints, frequent crashes especially during monetary transactions, unfair algorithms leading to repeated losses or bans, poor customer support, and difficulties with withdrawal and subscription cancellation. These repeated concerns have led to distrust and frustration despite the game's entertaining elements. ### Pros - Fast paced and fun gameplay with multiple playing options and daily bonus points. - The game offers tournaments and the ability to win real money. - Includes a 5 card win rule which is not common in similar games. ### Cons - The game requires energy to play, limiting the number of games before waiting or paying, which frustrates users. - Frequent crashing and freezing issues, especially when money is involved, causing loss of progress and funds. - Unfair and possibly rigged algorithm favoring top players and leading to player bans without clear reasons. - Poor customer support and difficulty in withdrawing winnings or canceling subscriptions, leading to user distrust. - False advertising about winning large sums of money and payout delays (4-5 days) disappoint users. ## Similar extensions and apps - [21 Blitz : Card Game](https://chrome-stats.com/d/com.twenty.blitz.card.game) — 4,488 users, 3.79 / 5 - [21 Rush - Ultimate Card Game](https://chrome-stats.com/d/com.chennaigames.rush21.blackjack) — 6,096 users - [21 Blitz: Blast Game](https://chrome-stats.com/d/com.codebizz.blast21blitzcardgame) — 152 users - [Blitz21: Fast Card Puzzle](https://chrome-stats.com/d/com.pfcgaming.blitz21) — 43 users - [Classic Blackjack: 21 Card](https://chrome-stats.com/d/com.vojoygames.blackjack21) — 2,866 users - [BlackJack 21](https://chrome-stats.com/d/com.kavuntek.blackjack) — 651 users - [Fortune Blackjack Rush](https://chrome-stats.com/d/com.housing.cancer.around.reverse) — 115,618 users, 4.70 / 5 - [Blackjack 21](https://chrome-stats.com/d/com.itsstorytimeuk.blackjack21) — 95 users - [Blackjack 21 – Card Game](https://chrome-stats.com/d/com.gevorg.blackjack) — 6,145 users, 3.83 / 5 - [Blackjack Blitz](https://chrome-stats.com/d/org.flonga.blackjackblitz) — 172 users - [Deck 21 - Twenty one Genius](https://chrome-stats.com/d/com.ericcmark.deck) — 251 users - [Blackjack 21](https://chrome-stats.com/d/com.olpik.blackjack21) — 435 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.tetherstudios.blitz21practice)