<?php
header('Content-Type: text/html; charset=windows-1251');
session_start();

function ShowForm($text)
{
$str = <<< ANSWER
<form method="post">
<br>
Закончите последовательность
<br>
{$text}
<br>
<input type="input" name="answer">
<input type="submit" value="дальше">
</form>
ANSWER;
echo $str;
}

if (!isset($_SESSION['sanswer']))
{
$_SESSION['sanswer'] = 0;

}
else
{
$_SESSION['sanswer'] = $_SESSION['sanswer'] +1;
}

if (!isset($_SESSION['iq']))
{
$_SESSION['iq'] = 0;
}

echo "<center>";

if ($_SESSION['sanswer'] == 0 )
{
ShowForm("1 2 3 4 5");
}

if ($_SESSION['sanswer'] == 1 )
{
ShowForm("5 6 7 8 9");
}

if ($_SESSION['sanswer'] == 2 )
{
ShowForm("1 3 5 7");
}

if ($_SESSION['sanswer'] == 3 )
{
ShowForm("2 4 8 16");
}

if ($_SESSION['sanswer'] == 4 )
{
ShowForm("2 4 6 8");
}

if ($_SESSION['sanswer'] == 5 )
{
ShowForm("1  7  13 19");
}

if ($_SESSION['sanswer'] == 6)
{
ShowForm("1  3 9 27");
}

if ($_SESSION['sanswer'] == 7)
{
ShowForm("10 100 1000 10000");
}

if ($_SESSION['sanswer'] == 8)
{
ShowForm("56 64 72 80");
}

if ($_SESSION['sanswer'] == 9)
{
ShowForm("80 100 130 150");
}

if ($_SESSION['sanswer'] == 1 && $_POST['answer'] == "6" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 2 && $_POST['answer'] == "10" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 3 && $_POST['answer'] == "9" ) 
{
$_SESSION['iq']+=1;
}

if ($_SESSION['sanswer'] == 4 && $_POST['answer'] == "32" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 5 && $_POST['answer'] == "10" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 6 && $_POST['answer'] == "25" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 7 && $_POST['answer'] == "81" ) 
{
$_SESSION['iq']+=1;
}

if ($_SESSION['sanswer'] == 8 && $_POST['answer'] == "100000" ) 
{
$_SESSION['iq']+=1;
}

if ($_SESSION['sanswer'] == 9 && $_POST['answer'] == "88" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 10 && $_POST['answer'] == "180" ) 
{
$_SESSION['iq']+=1;

}

if ($_SESSION['sanswer'] == 10)
{
echo "Вы набрали " .$_SESSION['iq']*10 . " баллов";
}

?>