Download the puzzles from the May print issue of Chemistry World
There are four prize puzzles: crossword (cryptic answers only), wordoku, molecule search and word grid. For each puzzle, a winner and a runner-up will be selected from all the correct entries received. The winners will receive a £25 book voucher. You can enter any or all of the prize draws, but each entrant is only eligible to win one of the individual prizes each month.
Alternatively, you can send your answers to the address below:
Royal Society of Chemistry
Thomas Graham House
Cambridge CB4 0WF