1. Introduction of the game:
Welcome to the vibrant and amusing world of "Zooba: Fun Battle Royale Games," a unique twist on the battle royale genre, where the champions aren't soldiers or knights but a diverse cast of adorable animals, each with its unique abilities. This free-to-play, multiplayer experience combines elements of MOBA (Multiplayer Online Battle Arena) games with the survival tactics of a battle royale, creating a fast-paced and strategic game where players fight to be the last one standing in this zoo-themed showdown.

2. All characters and levels of the game:
Zooba boasts a roster of whimsical characters or zoo residents, each with their own set of skills, attack modes, and roles that range from tanks and supports to assassins and fighters. The characters include Bruce the bear, Nix the fox, and many more, each adding their own fun and strategic edge to the gameplay. As for levels, players fight across various dynamic arenas within the zoo, which evolve as players progress and unlock new areas to explore and dominate.

3. What attracts users most to the game:
Players are attracted to Zooba for its colorful graphics, engaging animal avatars, and the unique blend of MOBA and battle royale mechanics that keep the gameplay fresh and exciting. The easy-to-learn controls, combined with the depth of character customization through upgrades and equipment, ensure that both casual and hardcore gamers have something to enjoy.

4. Why it is popular:
"Zooba: Fun Battle Royale Games" is popular due to its approachability and the clever twist it puts on traditional battleground gameplay by incorporating zany characters and environments. Its popularity is also driven by the fact that it's designed to be quick and entertaining, with matches that can be played in short bursts of time, making it perfect for gaming on the go.

5. The most difficult part of the game:
The most challenging aspect of Zooba can often be the unpredictability of the battles, especially when competing against a large number of players, all vying for victory. As levels advance and more skilled opponents come into play, mastering each animal’s unique abilities and effectively using the environment to your advantage become increasingly difficult.

6. Strengths and weaknesses of the game:
Strengths of Zooba include its engaging and easy-to-pick-up gameplay, a diverse range of characters, and the constant updates that keep the game fresh and challenging. However, the game's weaknesses might include occasional balance issues with characters, potential pay-to-win elements as players can purchase upgrades and items, and the dependence on in-app purchases for faster progression.

7. What other games have been developed by the same developer:
Zooba is developed by Wildlife Studios, a game development company that has also produced other popular titles such as "Tennis Clash," "Castle Crush," and "War Machines." These games, like Zooba, offer quick and captivating gameplay and have garnered substantial user bases in their respective genres.