X Multiply (World, M81)

X Multiply (World, M81) is a classic horizontal shoot 'em up (shmup) developed by Irem, renowned for its unique biological art style and distinctive gameplay mechanics. In this game, players control a small spacecraft, tasked with navigating through environments teeming with organic enemies and obstacles, with the ultimate goal of destroying colossal alien organisms.

The core innovation of X Multiply lies in its unique "tentacle" power-up system. Unlike traditional shooters that often feature independent "options" or "forces," X Multiply introduces flexible tentacles that attach to the player's ship. These tentacles, initially small and weak, grow longer, stronger, and capable of attacking in various directions as power-up icons are collected. Players can strategically position these tentacles, using them not only to attack enemies but also to absorb bullets or shield their ship from collisions.

The gameplay of X Multiply demands a combination of evasive skills, precise positioning, and power-up management. Enemies in the game are diverse, ranging from fast-moving small creatures to larger organic structures that fire various types of projectiles. Levels are designed with numerous dynamic and static obstacles, requiring players to constantly move and react quickly. Boss battles are another highlight, featuring gigantic bosses, often with multiple weak points and distinct attack phases, requiring players to learn their patterns and make full use of their tentacles' capabilities.

Power-up items include speed boosts for the ship, upgrades for the main weapon, and most importantly, tentacle upgrade icons that help them grow in size and power. Collecting enough of these items is key to progressing through the increasingly challenging stages. With its detailed "bio-horror" graphics and challenging gameplay, X Multiply offers a unique and memorable arcade shooting experience.