SpaceChem

- Doing one mission, taking a look at the new task, sleeping on it and working out a solution the next day is a perfectly respectable pace.

- If both waldos reach an identical command in the same tile at the same time, red goes first.

- Right click on all the symbols to see what they can do.

- Bond commands don't have to be placed on bonders.

- You can move the Start command like every other command, and right click to change the starting direction.

- You can drag your mouse to select multiple commands. So if you want to restart a level you can select everything and press delete.