If you are at all familiar with RPGs, you will probably know most of
this stuff already, but read it anyway, as we probably do things
slightly differently than you expect.
Basic Dice
The dice you will need for this game are a sixsided die, and two
tensided dice (preferably different colours). One such set for
everyone playing will make everything go much faster.
The ten sided die is referred to as a "d10" and is numbered from 0 to
9. Unlike many other roleplaying games where a roll of "0" on a d10
counts as a ten, in Infinite Horizons, it is zero (if your d10 goes from
1 to 10, the ten should be read as a 0).
The sixsided die, just like the one used in almost every board game
since the beginning of time, is called a "d6".
Another common requirement is the percentile die roll, denoted as
"d%". You can get a hundredsided die for this, but these dice are
expensive, and not usually as random as rolling two d10s, taking one as
the tens digit, and the other as the ones digit. This is the reason for
having two different colour d10s; you can always say "the purple one is
the tens" before rolling, and then not have to worry about whether that
1 and 9 is a 19 or a 91 (or be rightly accused of cheating if you always
pick the more advantageous of the two). In Infinite Horizons, a roll of
"00" on a d% is read as a 0, not as 100 as in many games; the possible
range for a d% roll is 0 to 99.
Combinations
If you see "3d6", this means you need to roll three sixsided dice (or
roll one sixsided die three times) and add up the rolls. Similarly,
"5d10" means roll five tensided dice, and add the rolls together.
Remember that the range for a d10 is 0 to 9, so the range for 5d10 is 0
to 45, not 5 to 50.
If you see "d6+3", this means roll a d6, and add three to the result.
"2d6+8" means roll 2d6 and add 8 to the total; do not roll d6+8 twice
and add the two numbers! "d104" means subtract four from the number
rolled on a d10. No die roll can go below zero; any negative result is
treated as zero (if you roll anything from 0 to 4 on a d104, read the
result as 0).
Other Dice
There are many dice made with numbers of sides other that 6 and 10 (we
have seen 4, 7, 8, 12, 20, 30, 100, as well as a d6 marked to be a d2 or
d3, and there are almost certainly others). These are not necessary,
although they may be helpful sometimes. For example, if you need to
randomly determine the day of the month something happens on, a d30
would be the easiest way (assuming 30 days in the month). However, by
using a d6 (treating 1 or 2 as 0, 3 or 4 as 1, 5 or 6 as 2) as the tens
digit, and a d10 for the ones digit, the same result may be achieved.
Or, you could just roll d% until you get a number between 1 and 30. If
something was going to happen between 5:00 and midnight, you could use
d8+4 for the hour, or you could use a d10+5, rerolling any 13 or 14. In
short, any roll made by any of these custom dice may be emulated easily
with your d6, d10, d%, and a little imagination.

