opiate. 1  a drug containing opium or its derivatives, used in medicine for inducing sleep and relieving pain. 2  any sedative, soporific, or narcotic. 3  anything that causes dullness or inaction or that soothes the feelings. 4  mixed or prepared with opium. 5  inducing sleep; soporific; narcotic. 6  causing dullness or inaction. 7  to subject to an opiate; stupefy.
Each puzzle has one and only one unique solution, and each can be solved using only pure logical deduction-guessing and trial-and-error methods are never required for these puzzles. If you're new to numbergrids, try the smaller puzzles first, then move on to the larger ones.
Gotcha type puzzles, where there's some trick to getting the right answer. Crosswords, but with numbers instead. Complete the grid such that every row, every column, and the nine 3x3 blocks contain the digits from 1 to 9. Classic puzzles and old favourites. Puzzles which require you to rotate 3D objects in your head.