error in sql from php

error in sql from php

i am not seeing it... When i echo the output everything is shown correct.
But when i write it to the database i get an error...
mysql_query("INSERT INTO features (titel_alias, titel, platform, uitgever,
ontwikkelaar, engine, gamesoort, genre, multiplayer, coop, spelers,
speelduur, release, metacritic, leeftijd) VALUES ('$titel_alias',
'$titel', '$platform', '$uitgever', '$ontwikkelaar', '$engine',
'$gamesoort', '$genre', '$multiplayer', '$coop', '$spelers', '$speelduur',
'$release', '$metacritic', '$leeftijd')") or die("Error:
".mysql_error());
Error: You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near
'release, metacritic, leeftijd) VALUES
And it tells me this over and over at the release part
The echo below works... i am really not seeing it...
echo $titel . "<br/>";
echo $titel_alias . "<br/>";
echo $ontwikkelaar . "<br/>";
echo $uitgever . "<br/>";
echo $engine . "<br/>";
echo $platform . "<br/>";
echo $gamesoort . "<br/>";
echo $genre . "<br/>";
echo $multiplayer . "<br/>";
echo $coop . "<br/>";
echo $spelers . "<br/>";
echo $speelduur . "<br/>";
echo $leeftijd . "<br/>";
echo $metacritic . "<br/>";
echo $release . "<br/>";