Spelunky (also known as Spelunky HD) is a remake of Spelunky (now known as Spelunky Classic), an open source indie platformer video game created by Derek Yu and originally released as freeware for Microsoft Windows. The player controls a spelunker who explores a series of caves while collecting treasure, saving damsels, fighting enemies and dodging traps. The caves are procedurally generated, making each run through the game unique. Spelunky is one of the first examples of a roguelike-like, borrowing concepts from the roguelike genre, and was the influence for many later roguelike-like games.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.