diff --git a/validation/src/check.rs b/validation/src/check.rs
index 24927c9..cc4098a 100644
--- a/validation/src/check.rs
+++ b/validation/src/check.rs
@@ -51,6 +51,20 @@ struct ModeID(u64);
 impl ModeID{
 	const MAIN:Self=Self(0);
 	const BONUS:Self=Self(1);
+	fn write_start_zone(&self,f:&mut std::fmt::Formatter<'_>)->std::fmt::Result{
+		match self{
+			ModeID(0)=>write!(f,"MapStart"),
+			ModeID(1)=>write!(f,"BonusStart"),
+			ModeID(other)=>write!(f,"Bonus{other}Start"),
+		}
+	}
+	fn write_finish_zone(&self,f:&mut std::fmt::Formatter<'_>)->std::fmt::Result{
+		match self{
+			ModeID(0)=>write!(f,"MapFinish"),
+			ModeID(1)=>write!(f,"BonusFinish"),
+			ModeID(other)=>write!(f,"Bonus{other}Finish"),
+		}
+	}
 }
 #[allow(dead_code)]
 pub enum ZoneParseError{
@@ -171,10 +185,20 @@ impl<'a> StringCheckContext<'a>{
 		}
 	}
 }
+impl<'a> std::fmt::Display for StringCheckContext<'a>{
+	fn fmt(&self,f:&mut std::fmt::Formatter<'_>)->std::fmt::Result{
+		write!(f,"expected: {}, observed: {}",self.expected,self.observed)
+	}
+}
 
 // check if a string is empty
 pub struct StringEmpty;
 pub struct StringEmptyCheck<Context>(Result<Context,StringEmpty>);
+impl std::fmt::Display for StringEmpty{
+	fn fmt(&self,f:&mut std::fmt::Formatter<'_>)->std::fmt::Result{
+		write!(f,"Empty string")
+	}
+}
 
 // check for duplicate objects
 pub struct DuplicateCheckContext<ID>(HashMap<ID,u64>);
@@ -353,6 +377,102 @@ impl<'a> MapCheck<'a>{
 	}
 }
 
+fn comma_separated<T,F>(f:&mut std::fmt::Formatter<'_>,mut it:impl Iterator<Item=T>,custom_write:F)->std::fmt::Result
+where
+	F:Fn(&mut std::fmt::Formatter<'_>,T)->std::fmt::Result,
+{
+	if let Some(t)=it.next(){
+		custom_write(f,t)?;
+		for t in it{
+			write!(f,", ")?;
+			custom_write(f,t)?;
+		}
+	}
+	Ok(())
+}
+
+impl<'a> std::fmt::Display for MapCheck<'a>{
+	fn fmt(&self,f:&mut std::fmt::Formatter<'_>)->std::fmt::Result{
+		if let StringCheck(Err(context))=&self.model_class{
+			writeln!(f,"Invalid Model Class: {context}")?;
+		}
+		if let StringCheck(Err(context))=&self.model_name{
+			writeln!(f,"Invalid Model Name: {context}")?;
+		}
+		match &self.display_name{
+			Ok(StringEmptyCheck(Ok(StringCheck(Ok(_)))))=>(),
+			Ok(StringEmptyCheck(Ok(StringCheck(Err(context)))))=>writeln!(f,"Invalid DisplayName: {context}")?,
+			Ok(StringEmptyCheck(Err(context)))=>writeln!(f,"Invalid DisplayName: {context}")?,
+			Err(StringValueError::ObjectNotFound)=>writeln!(f,"Missing DisplayName StringValue")?,
+			Err(StringValueError::ValueNotSet)=>writeln!(f,"DisplayName Value not set")?,
+			Err(StringValueError::NonStringValue)=>writeln!(f,"DisplayName Value is not a String")?,
+		}
+		match &self.display_name{
+			Ok(StringEmptyCheck(Ok(StringCheck(Ok(_)))))=>(),
+			Ok(StringEmptyCheck(Ok(StringCheck(Err(context)))))=>writeln!(f,"Invalid Creator: {context}")?,
+			Ok(StringEmptyCheck(Err(context)))=>writeln!(f,"Invalid Creator: {context}")?,
+			Err(StringValueError::ObjectNotFound)=>writeln!(f,"Missing Creator StringValue")?,
+			Err(StringValueError::ValueNotSet)=>writeln!(f,"Creator Value not set")?,
+			Err(StringValueError::NonStringValue)=>writeln!(f,"Creator Value is not a String")?,
+		}
+		if let Err(_parse_game_id_error)=&self.game_id{
+			writeln!(f,"Model name must be prefixed with bhop_ surf_ or flytrials_")?;
+		}
+		if let Err(())=&self.mapstart{
+			writeln!(f,"Model has no MapStart")?;
+		}
+		if let DuplicateCheck(Err(DuplicateCheckContext(context)))=&self.mode_start_counts{
+			write!(f,"Duplicate start zones: ")?;
+			comma_separated(f,context.iter(),|f,(mode_id,count)|{
+				mode_id.write_start_zone(f)?;
+				write!(f,"({count} duplicates)")?;
+				Ok(())
+			})?;
+			writeln!(f,"")?;
+		}
+		if let AtLeastOneMatchingAndNoExtraCheck(Err(context))=&self.mode_finish_counts{
+			// perhaps there are extra end zones (context.extra)
+			if !context.extra.is_empty(){
+				write!(f,"Extra finish zones with no matching start zone: ")?;
+				comma_separated(f,context.extra.iter(),|f,(mode_id,count)|{
+					mode_id.write_finish_zone(f)?;
+					Ok(())
+				})?;
+				writeln!(f,"")?;
+			}
+			// perhaps there are missing end zones (context.missing)
+			if !context.missing.is_empty(){
+				write!(f,"Missing finish zones: ")?;
+				comma_separated(f,context.missing.iter(),|f,mode_id|{
+					mode_id.write_finish_zone(f)?;
+					Ok(())
+				})?;
+				writeln!(f,"")?;
+			}
+		}
+		if let Err(())=&self.spawn1{
+			writeln!(f,"Model has no Spawn1")?;
+		}
+		if let DuplicateCheck(Err(DuplicateCheckContext(context)))=&self.spawn_counts{
+			write!(f,"Duplicate spawn zones: ")?;
+			comma_separated(f,context.iter(),|f,(SpawnID(spawn_id),count)|{
+				write!(f,"Spawn{spawn_id}({count} duplicates)")?;
+				Ok(())
+			})?;
+			writeln!(f,"")?;
+		}
+		if let DuplicateCheck(Err(DuplicateCheckContext(context)))=&self.wormhole_out_counts{
+			write!(f,"Duplicate wormhole out: ")?;
+			comma_separated(f,context.iter(),|f,(WormholeOutID(wormhole_out_id),count)|{
+				write!(f,"WormholeOut{wormhole_out_id}({count} duplicates)")?;
+				Ok(())
+			})?;
+			writeln!(f,"")?;
+		}
+		Ok(())
+	}
+}
+
 pub struct CheckReportAndVersion{
 	pub status:Result<MapInfoOwned,String>,
 	pub version:u64,