Koutetsu Teikoku

Game Details:

• Three-stage transformation: Instant switching between fighter/semi-humanoid/full mech forms
• Overheat system: Continuous shooting requires manual cooling, otherwise self-destruction
• London style: Big Ben gear stage + Thames submarine battle
• Hidden units: 7 special fighters including the Zeppelin

A key: Main weapon (changes with form), B key: Sub weapon (consumes steam), ↓+B: Release full-screen ultimate. Destroying red engine parts can trigger chain explosions, while "coal supply points" require graze collection. The true ending requires a no-damage run through the Gear Fortress to unlock the ultimate "Perpetual Motion Machine Mode"!

Editor's Recommendation:

This forgotten shooting gem pushes the aesthetics of steampunk machinery to the extreme! From the three-stage transformation system of propeller fighters to mech forms, coupled with particle effects of ruptured hydraulic pipes, each level is a rhapsody of the industrial revolution. The hidden "Golden Zeppelin" has a unique Tesla coil weapon, and the "Infinite Gear Mode" unlocked in the second playthrough will cause all enemy aircraft to become steam-overloaded and berserk. Although the difficulty is hardcore, the explosion animation with hydraulic steam erupting when you destroy the final BOSS "Giant God Soldier" with the last shell is definitely worth savoring again and again!