Kudos to this guy's Excel prowess. I can't play it at work, but seriously, this sounds insanely crazy and kind of awesome. A guy programmed a full RPG game into an Excel file.
Random enemies: Over 2000 possible enemies with different AI abilities.
Random items: 39 item modifiers result in over 1000 possible item combinations and attributes.
An interesting story with 4 different endings depending on how the player has played the game.
8 boss encounters, each with their own tactics.
4 pre-programmed arenas followed by procedurally generated arenas. Each play-through has its own challenges.
31 Spells. There are many different strategies for success.
15 Unique items. Unique items have special properties and can only drop from specific enemies.
This is all in a Microsoft Excel workbook.
Download the excel game here (http://carywalkin.files.wordpress.com/2013/03/v1-0-arena.xlsm)