| Key Word | Puzzlet Number | Title |
| UniDigits |
78 | UniDigits from Products |
| 94 | UniDigits from Squared Triples |
| 98 | Derived UniDigit Numbers |
| 130 | A Square from Two UniDigits |
| 187 | UniDigits Embedded In Factorials |
| 192 | UniDigits from 7-Segment Displays |
| Upside-Down |
21 | An Upside-Down PanDigital! |
| Volume |
18 | Volume of a Tank |
| Waves |
96 | Palindromic Waves |
| Weights |
17 | Combining Weights |
| 47 | Five Weights |
| Zero |
204 | Prime Runs including Zero |
| 0 |
198 | Counting 1's and 0's in Binary |
| 1 |
131 | Primes of Type 4n - 1 |
| 198 | Counting 1's and 0's in Binary |
| 202 | Make 1 from a Pandgital |
| 2 |
14 | Triplets of 2-digit Integers |
| 74 | A run from two squares |
| 76 | Two Triangles |
| 130 | A Square from Two UniDigits |
| 140 | A Square from two Runs |
| 141 | A 10-digit Pandigital from 2nd/3rd Powers |
| 163 | The Difference of Two Squares |
| 3 |
37 | A 10-digit Pandigital from 3rd/4th Powers |
| 119 | Three Squares |
| 141 | A 10-digit Pandigital from 2nd/3rd Powers |
| 154 | 3-Digit Integer Reversal for any Base Change |
| 156 | A 3-Digit Formula |
| 4 |
37 | A 10-digit Pandigital from 3rd/4th Powers |
| 60 | Fourth Powers |
| 5 | 47 | Five Weights |
| 6 | 53 | Six-Palindromic Odd Numbers |
| 7 | 192 | UniDigits from 7-Segment Displays |
| 10 |
37 | A 10-digit Pandigital from 3rd/4th Powers |
| 141 | A 10-digit Pandigital from 2nd/3rd Powers |
| 15 |
110 | Repeated Digit Sums and 15 |
| 20 | 118 | Twenty Bricks |
| 31 |
73 | Anagrammatic Products & 31 |
| 100 |
2 | Make 100 From A PanDigital |
| 10,000 |
104 | Sum to 10,000 |
| 1,000,000 | 46 | One Million |
| 80 | A Million in Cubes |