IDB tiers don't go by the actual beatability — hence every map would be T0. Instead, IDB tiers are calculated by how easy/hard a fast route would be on a map and difficulty mixed together.
T0
Maps in this tier quite literally do not have any / have very few obstacles in your way.
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T1
Very easy. You can learn a map of this tier in about 3 minutes.
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T2
Mild obstructions, still easy, though.
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T3
A little difficult, might take you 15-30 minutes to learn maps of this tier.
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T4
This is where some people may struggle on maps, and high speed is harder to handle (think bhop_arcane).
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T5
At this point, maps require at least some precision, or good routing skills.
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T6
Maps in this range often take some hours to beat, props to you if you beat any maps from here on out.
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T7
A lot of tech maps go into this range, most maps here are also linear.
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T8
You are either very passionate about infinite, or mentally insane. Either way, a good map to think of in this tier is bhop_4loshadka.
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T9
You are too good at infinite...
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