Sonic's Secrets: Columns.

Extra Magic Jewels.

There is a way to trick the game into giving you a second magic jewel. To do this you must set up the screen in a certain way:

Have one row of the normal jewels stacked up almost to the top of the playfield. There must be space for only two of the three jewels in the next block to come on the screen. Watch the "Next Block" preview box. When you see that the magic jewel block is next, get ready to
quickly move it on top of your prepared stack. After the magic jewel eliminates the 'touching' color jewels, all of the remaining jewels will drop down as will the one magic jewel that was off the screen. This magic jewel will drop down and eliminate another group of colored jewels!

Free Points.

To get a fast and easy 10,000 bonus points, have one vertical column empty all the way to the bottom of the playfield. When you get the block of magic jewels, position it so that it falls down this column, all the way to the bottom. Since you don't get to use it to eliminate any colored jewels, the game gives you 10,000 points instead.