These are the highest scoring letters in the bag but they are not the only way of scoring. Don't waste them but try to play them as soon as you can. These letters have a high value because they are awkward; having them on your rack will cut down the variety of plays you make.

The X is the most flexible of the 4; you should aim to score around 30 with the X other than at the very end of the game where opportunities will be scarcer. Remember there are five 2 letter words containing the X - AX, EX, OX, XI and XU.

If you are looking to learn a few useful unusual words, the J, Q, X, Z words are good ones to concentrate on. A good way to remember them is in pairs e.g. OJIME (a carved bead used as a clasp) and OXIME (chemical compound) or TOAZE (alternative for tease) and TOUZE (to haul).