Sure, here are some Android tablet games that you may enjoy playing, whether online or offline, and are not easily boring:
1. Alto's Odyssey - A beautiful endless runner game set in a stunning desert landscape with smooth gameplay and calming music.
2. Plants vs. Zombies 2 - A popular tower defense game where you strategically place plants to fend off waves of zombies. It's challenging and entertaining.
3. Asphalt 9: Legends - A high-octane racing game with stunning graphics and a wide selection of cars to choose from. You can race against AI or real players online.
4. Minecraft - A sandbox game where you can build, explore, and survive in a blocky world. It offers both creative and survival modes for endless fun.
5. Wordscapes - A relaxing word puzzle game where you swipe to connect letters and form words. It has thousands of levels to keep you entertained.
6. Shadow Fight 3 - A visually stunning fighting game with RPG elements and a compelling storyline. You can fight in duels or engage in online battles.
7. Monument Valley 2 - A visually stunning puzzle game with mind-bending levels and a touching story. It offers a unique gameplay experience that's hard to put down.
8. Among Us - A popular multiplayer game where you work together to complete tasks on a spaceship while trying to identify the impostor among the crew. It's fun and addictive.
These games offer a mix of genres and gameplay styles to keep you entertained for hours on your Android tablet. Enjoy playing!