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To play, you will need a d100 (percentile dice), a d10, and a Likelihood table. One is provided below, but you may substitute your own percentages if you want to tweak your chances.

• A way to record the events of your game and/or to keep track of bonuses and penalties is recommended, but not required.

RPGSolo runs on the Yes, And/No, But system.

• Yes, and...: Not only is the outcome successful, but it's better than you expected; you are even better off than you would have been from achieving what you meant to do. Situations you are observing turn out to have some extra good news involved, or you gain even more thorough insight than you were looking for at first.

• Yes: You achieve your goal.

• Yes, but...: You achieve your goal, but there's a hitch or it comes at a cost.

• No, but: You fail your goal, but not completely. If you are making an observation, the situation isn't great, but there's a silver lining.

• No: You fail your goal.

• No, and...: Not only is the outcome a failure, but it's even worse than you thought, and/or you're worse off than if you had left it alone.

The Likelihood of a given roll dictates how likely you are to receive one of the above six outcomes. Each Likelihood lists the corresponding results on a scale from 1 to 100.

• No matter the Likelihood you are rolling from, there will always be a chance no matter how small to roll each outcome. Almost Impossible has a tiny chance to roll 'Yes, and...' and Sure Thing has a tiny chance to roll 'No, and...'

Optionally: you may add modifiers to increase or decrease your chances in a given scenario. Your character might be a trained fighter; they might have a sprained ankle; they might have found a flashlight; they may have a bad reputation in town which makes interactions with the townsfolk more hostile.

• Each point on a modifier counts for +1 or -1 Likelihood. A +1 turns a 50/50 into a Somewhat Likely, a -3 turns a Likely into a Somewhat Unlikely, and so on.

• Some modifiers make a bigger difference than others. A friendly demeanor might add a +1 bonus to checks involving interactions with the surly townsfolk, where that sprained ankle might be a -3 penalty to attempts to move quickly.

• Optionally: you may also add modifiers to change the outcome of a roll, not the Likelihood; a 'No, but...' becomes a 'Yes, but...' for example. These have a much stronger influence on your game, and you may want to use them sparingly.

• You may assign modifiers to your player characters--or other characters, or locations, or anything else--ahead of time, or you may add or remove modifiers during play as you feel they are appropriate.

At the beginning of each turn, decide what action you want to take, what observations you want to make, or what happens in the world around you.

Roll 1d10 to determine the difficulty of an action.

• 1: Almost Impossible

• 2: Very Unlikely

• 3: Unlikely

• 4: Somewhat Unlikely

• 5: 50/50

• 6: Somewhat Likely

• 7: Likely

• 8: Very Likely

• 9: Sure Thing

• 10: Reroll with +1 bonus (or just reroll, if you'd rather)

Add any appropriate modifiers to determine the Likelihood of the roll.

If you check the Likelihood of a roll and don't like your chances, you can choose not to pursue it.

• If there are any rolls you might want to come back to and try again later, you may want to make a note of it on the side. You might decide to leave a door with an alarm alone until you can find some tools to disarm it with, for example.

If you decide to proceed, roll 1d100 and consult the appropriate Likelihood table.

Add any appropriate outcome modifiers to determine the result.

Decide how to interpret the result.

• In case of wording you're not sure of ('do the guards notice me?' for example), a lower outcome is generally negative. You may want to write out the translated result next to the 'yes, and/no, but' result, for the sake of clarity.

• If you're rolling to decide between multiple options instead of for negative/positive outcomes, you may use your d10 as a yes/no oracle, or use 'yes, and/no, but' to roll for the degree to which the result falls between the presented options.

• Oracle between 2 options:

• 1-5: No/First option

• 6-10: Yes/Second option

• Oracle between 3 options:

• 1-3: No/First Option

• 4-6: Neither/Both/In-Between/Second option

• 7-9: Yes/Third option

• 10: Reroll, or secret fourth option

If you want to make more than one roll to determine what's going on before you continue the narrative, feel free to make as many in a row as you want before you describe what happens.

Optionally: you can use a Do-Over to redo a roll, or directly choose your outcome, if you really don't want to continue with what you got.

• It's recommended that you limit the number of these you have access to, if you want to keep some challenge in your game (5 Do-Overs per scene, for example), but you don't have to. You can do it as many times as you want; it comes down to what's most fun for you.

Write out what happens as a result of the outcome you rolled, until you reach the next point where you want the dice to show you the way.

Happy roleplaying!

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Likelihood Table

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Almost Impossible/Sure Thing:

-No, and...: 30% (1-30) [...] 1% (1)

-No: 50% (31-80) [...] 3% (2-4)

-No, but...: 11% (81-91) [...] 5% (5-9)

-Yes, but...: 5% (92-96) [...] 11% (11-19)

-Yes: 3% (97-99) [...] 50% (20-69)

-Yes, and: 1% (100) [...] 30% (70-100)

Very Unlikely/Very Likely:

-No, and...: 20% (1-20) [...] 3% (1-3)

-No: 40% (21-60) [...] 5% (4-8)

-No, but...: 20% (61-80) [...] 12% (9-20)

-Yes, but...: 12% (81-92) [...] 20% (21-40)

-Yes: 5% (93-97) [...] 40% (41-80)

-Yes, and...: 3% (98-100) [...] 20% (81-100)

Unlikely/Likely:

-No, and...: 15% (1-10) [...] 5% (1-5)

-No: 30% (11-50) [...] 10% (6-15)

-No, but...: 20% (51-70) [...] 20% (16-35)

-Yes, but...: 20% (71-85 [...] 20% (36-55)

-Yes: 10% (85-95) [...] 30% (56-85)

-Yes, and...: 5% (96-100) [...] 15% (86-100)

Somewhat Unlikely/Somewhat Likely:

-No, and...: 10% (1-10) [...] 10% (1-10)

-No: 30% (11-40) [...] 20% (11-30)

-No, but...: 20% (41-60) [...] 10% (31-40)

-Yes, but...: 10% (61-70) [...] 20% (41-60)

-Yes: 20% (71-90) [...] 30% (61-90)

-Yes, and...: 10% (91-100) [...] 10% (91-100)

50/50:

No, and...: 10% (1-10)

No: 20% (11-30)

No, but...: 20% (31-50)

Yes, but...: 20% (51-70)

Yes: 20% (71-90)