Luxembourg's Power Shot is the Plant Shot. This shot is particularly difficult to block because it fires three spores in rapid succession. A large plant with a mouth sprouts from the ground and fires the first spores on the ground in front of the goal, the second spore fires towards the upper half of the goal (KO's you), and the third and final fires on the ground in front of the goal. This is difficult to block because each spore can make the defender unconsious. All the spores contain the ball, and if the defender successfully blocks the third spore, a large vine will descend from the top of the screen and eat the defender, causing him/her to disappear.
Luxembourg, like Greece, Denmark and all the characters after Colombia, has a special Counter Attack. This Counter Attack will send a plant shooting straight forward, which eats the target upon contact and sets Luxembourg up to score.
When used in the midfield, there's a very high chance of scoring.
When used in the front, there's very high chance of scoring.
When used too far forward, there's very low chance of scoring.
When used too far, there's low chance of scoring.
To unlock Luxembourg, you must defeat 39 characters (every character in the game, up to the last character of the 2.2 update) without using kicking in Arcade. This can be a difficult task, especially when trying to face Asura (so it is recommended to skip him) mainly due to paying 50,000 points just to get an attempt to beat him. Or, to unlock Luxembourg instantly, you can pay 3,600,000 points. It is highly reccomended that you do not use Italy, as if the shot is countered back and you can't kick a goal for the opposition is inevitable.
A tip (if playing on a computer), is to make kick a key one you would never use, like the grave accent (the key right below Esc). That way, you will never use kick, even if you click the usual kicking key. If playing on a mobile device, the best thing to do is enter guided access mode and circle the kick button in the guided access setup screen, making it impossible to click.