Syllogica

Build the Venn-region diagram to prove which conclusion really follows — and unmask the ones that only seem to.

How to play

Each round gives you premises and a set of candidate conclusions. Assemble the Venn-region tiles that model the premises, then judge which conclusion the diagram actually supports. The trap is the fallacies — conclusions that sound right but break down on the regions, like an undistributed middle or an illicit conversion. Build the picture and let it decide.

• Read the premises
• Assemble the Venn regions that represent them
• Identify the conclusion that genuinely follows
• Reject the conclusions that commit a fallacy

Controls

• Desktop: click region tiles and conclusion options; some choices are keyboard-accessible too
• Phone & tablet: tap tiles and answers — fully touch-driven

Game modes

• Daily: the same arguments for everyone each day
• Practice: fresh arguments every run
• Easy, Medium and Hard add subtler fallacies and more terms

Tips & strategy

• Diagram what the premises force before looking at the conclusions
• Beware conclusions that overreach beyond what the regions guarantee
• Name the fallacy when you spot one — it confirms the rejection

What you'll learn

Syllogica teaches formal logic and fallacy-spotting through hands-on region diagrams, making valid and invalid arguments visible.

• Skills: formal logic, syllogisms, logical fallacies, Venn diagrams
• Best for: roughly grades 8–12 (ages 13+)
• For parents & teachers: valid reasoning and common fallacies, made visual.

About Syllogica

Syllogica is an original, free browser game that teaches formal logic and fallacy-spotting through hands-on region diagrams. It is built in-house and runs online.

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