Stacks is a simple and powerful kit to learn English tenses with 12 grammar bricks only.

3 levels to go - from 7 tasks in the easiest one up to 5 in the others.
4th level is to practice and test to make your grammar use self-acting.

It's even possible to solve each task just picking out the bricks and their sides.
If you face some troubles don't hesitate to press [Help] - you won't miss anything.

// Option A //

To download Stacks (no ads) mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Stacks (no ads) mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Stacks (no ads) from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Stacks (no ads) in HappyMod App.