HDOS Databank request 01 is basically a remake of Tetris Attack's Puzzle Mode (Panel de Pon in Japan), where blocks are removed by arranging three or more matching blocks in horizontal or vertical lines. This is achieved by swapping two blocks at a time, but be mindful that the number of moves allowed per stage is always limited.

Careful planning will be required to solve some of the later stages, especially when the only way to clear the entire screen is by chaining multiple combos from just a handful of swaps.

There is a video walkthrough here for the first twenty levels, but referring to it basically spoils all the fun (or frustration) to be had from figuring out the puzzles yourself. (Kongregate mirror)

Name: HDOS Databank request 01
Developer: GameReclaim
Category: Puzzle
Type: Browser