1. Introduction of the game:
Bloons TD 5 is an addictive tower defense game that challenges players to strategically defend against colorful "bloons" (balloons) attempting to invade their territory. With a combination of vibrant visuals, exciting gameplay, and a wide range of unique towers and upgrades, this game promises hours of endless fun and intense strategizing.

2. All characters and levels of the game:
In Bloons TD 5, players have access to numerous characters, each possessing their own special abilities and playstyles. From the steadfast Dart Monkey, powerful Super Monkey, to the explosive Bomb Tower, a diverse cast of towers awaits players to choose from and utilize in their defensive strategies. As the game progresses, players unlock new levels, each presenting its own set of challenges and intricacies to overcome.

3. What attracts users most to the game:
What draws users the most to Bloons TD 5 is the addictive and engaging gameplay. The perfect blend of strategy, fast-paced action, and the satisfaction of popping bloons provides an exciting experience that keeps players hooked. The variety of towers and upgrades available, coupled with the ability to customize and optimize one's strategy, ensures a unique and captivating gameplay experience for every player.

4. Why it is popular:
Bloons TD 5's popularity can be attributed to its strategic depth, replayability, and the constant updates and additions provided by the developers. The game offers a challenging progression system that keeps players engaged and motivated to unlock new towers and levels. Additionally, regular updates with new content, events, and challenges ensure a fresh and exciting experience that keeps players coming back for more.

5. When the game was released and how many versions are currently available:
Bloons TD 5 was initially released on November 15, 2011. Since then, it has gained immense popularity and spawned multiple versions across various platforms, including mobile devices, PC, and consoles. As of now, there are several versions available, including Bloons TD 5 Deluxe, Bloons TD 5 Mobile, and Bloons TD 5 Steam Edition, to name a few.

6. The most difficult part of the game:
One of the most challenging aspects of Bloons TD 5 lies in its later levels, where bloons become increasingly numerous, faster, and tougher to pop. Navigating through these formidable stages requires meticulous planning, precise timing, and strategic tower placement. Players must carefully allocate resources and make split-second decisions to overcome the relentless waves of bloons and prevent them from breaching their defenses.

7. Strengths and weaknesses of the game:
Bloons TD 5 boasts several strengths, including its vibrant and visually appealing graphics, extensive tower selection, and a variety of game modes to keep players engaged. Additionally, its addictive gameplay, frequent updates, and replayability add to its allure. However, some players may find the learning curve challenging, especially for newcomers to the tower defense genre. Additionally, unlocking certain upgrades and towers may require time or in-game purchases, which could be seen as a minor weakness.

8. What other games have been developed by the same developer:
Bloons TD 5 is a creation of Ninja Kiwi, a game development company known for its expertise in the tower defense genre. Apart from Bloons TD 5, Ninja Kiwi has developed other successful games such as Bloons TD 6, Bloons Monkey City, SAS: Zombie Assault, and Ninjakiwi Archive, among many others. Their diverse portfolio showcases their commitment to creating engaging and entertaining gameplay experiences for players worldwide.