Mortal Kombat X is a visceral, high-octane fighting game that thrusts players into a relentless battle for survival against the deadliest fighters of the Mortal Kombat universe. Developed by NetherRealm Studios, the game combines cinematic presentation with all-new gameplay to deliver the most brutal Kombat experience ever. Featuring a roster of new and returning Klassic Fighters, Mortal Kombat X delivers a deep story mode and an array of game modes.

**All characters and levels of the game:**
Mortal Kombat X includes a diverse lineup of characters, each with unique abilities and fatalities. Characters like Scorpion, Sub-Zero, Raiden, and Kitana are joined by new entrants such as Cassie Cage and Kotal Kahn. Players can also unlock alternate versions of characters with different fighting styles and move sets. The game features a variety of detailed and interactive levels, ranging from the eerie Jinsei Chamber to the lush and dangerous Outworld Jungles.

**What attracts users most to the game:**
It's the game's intense combat system, array of characters, remarkable visuals, and its infamous, gruesome finishing moves – the Fatalities – that captivate players. Mortal Kombat X also introduces Brutalities, a new, gruesome twist on combat that allows players to finish their opponents with eye-popping, jaw-dropping moves. The game's story mode, which spans several generations of the Mortal Kombat saga, also serves as a significant draw.

**Why it is popular:**
Mortal Kombat X has earned its popularity due to its intricate fighting mechanics, deep strategy, the legacy of its predecessors, and its ability to attract both casual and competitive players. The game stays fresh with the constant introduction of new content, remarkable balance, and the global online contests that pit the best fighters against each other in epic battles.

**When the game was released and how many versions are currently available:**
Mortal Kombat X was initially released in April 2015. Since then, an updated version titled Mortal Kombat XL was released in March 2016, which includes all previously released downloadable content (DLC), plus new characters and skins.

**The most difficult part of the game:**
One of the most challenging aspects of Mortal Kombat X is mastering the precise timing and execution required to perform advanced combos and the intricacies of the game's variations system. Additionally, the game's AI can be unforgiving on harder difficulties, and online play can present highly skilled opponents that offer a significant challenge.

**Strengths and weaknesses of the game:**
A major strength of Mortal Kombat X lies in its robust, visually stunning combat and the deep lore behind its characters. However, the game could also be polarizing for its graphic violence, and some players may find microtransactions for unlockable content to be a con. Performance issues on certain platforms at launch were a concern but have since been addressed in updates.