There was a download of Hydorah 1.1 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer is commonly called hydorah.exe or hydorah_demo_v1_2_1.exe etc. The most popular versions among the program users are 1.1 and 1.0. We recommend checking the downloaded files with any free antivirus. This free program was originally produced by Locomalito. The software lies within Games, more precisely Arcade.
From the developer:
Hydorah is a nonlinear classic shoot 'em up with a large library of levels and enemies. There is a single difficulty level, based on the 80s standards, that requires mastering in order to progress. Graphics are simple enough to not interfere with the gameplay, while they're polished to show the unique personality of each level.
You may want to check out more software, such as Palantir, Motherload or Tetris Revolution, which might be similar to Hydorah.