Excellent flash games

It's been awhile since anything has really sucked me in, but here are a few of the ones I've found lately:

• Electric Box. Very cool, set up a Rube Goldberg-type series of events to get power from the generator to the target.
• Color Infection 1 and 2. Simple, but a fun diversion.
• Bureau of Steam Engineering. That's not a direct link to the game, but to an explanation page. So you know what you're getting into.
• Codex of Alchemical Engineering. Again, that link is to the description page. Tough.
• Grid. More power-circuit adventures.

Good stuff.