Comments2)

Spoiler:

OK, if you want to know the answers.... then scroll down

'1' Just Click on 1 to go to 

'2' so the next one is

'III' - roman numerals so, the next page is 'IV.html'

'four' - in text, so the next page is 'five.html'

'ooooo' - five o's so the next page is 'oooooo.html'

'110' - binary representation of 6 - 7 in binary is '111'

'sept' - 7 in French, 8 is 'huit'

'thgie' - eight spelled backwards, so 'enin.html'

The next page appeard blank in most browsers, 'NINE' is written in black on a black backgrouns - so go to page 'TEN.html'

The next page is even more blank, but if you view source it tells you the next page is 'e_l_e_v_e_n.html'

'eeleeveen' - all the vowels are repeated - so 'tweelvee'

'a_dozen' - so thirteen is 'a_bakers_dozen'

'13, unlucky ...' - fill in the blanks 'for_some'

'196' - 14 squared, so, the solution is 15 squared '225'

'..-._.._..-._-_._._-.' - morse code for fifteen, so the next page is found using the international morse code for sixteen - '..._.._-..-_-_._._-..html'

'un_ar_bymtheg' - ok this one might stump a lot of people, but I've seen enough Welsh to figure out the origin and google this page http://www.sf.airnet.ne.jp/ts/language/number/traditional_welsh.html - so applying the rules leads us to 'dau_ar_bymtheg.html'

'1597' - wikipedia tells me this is a fibonacci number, the 17th, and the next one in sequence is '2584'

Another blank page with the title 'EIGHteen' - so no great puzzle solving ability is required to figure out the next page is 'NINEteen.html'

As soon as we go there it takes us back, there's javascipt on the page that redirects you back to page 18, but we can disable javascript and see a page with the clue '___nineteen___' so lets go to page '___twenty___.html'

The page has the number 20 in the middle, but it's not text, it's an image 'twnt.png' - so a bit of guessing took me to 'twnton.html'

'orziot_jiz' - is 'twenty_one' with a Caesar shift of 5 letters applied to it, encoding 'twenty_two' with the same shift does not work, the shift is a function of the number - 21+5 = 26, so use a shift of 4 and find the next page at 'psajpu_psk.html'

'has_9' - twenty two has 9 letters, twenty three 'has_11.html'

'the hour before' - 23:00 is the hour before 'midnight.html'

'fn_four_point_eight_nine_eight_nine_seven_nine_fou...' wtf?, ok it's a rounded off number, and fn represents some function. fn is the square root function, and the square root of the next number is 5 - so go to page 'fn_five.html'

'x19' - easy, this is hex encoded 25, so the next page is 'x1a.html'

'26' on a not quite black background, viewing the source we see a the background is set to the colour 1a001a - and we know that x1a is hex for 26 - so the next page is found at '1b001b.html'

Now we're faced with another blank page, and the only difference is that the style sheet reference is 'stylee.css' rather than 'style.css', so, comparing the two we see an extra comment line '#bbabb', now, 27 in binary is 11011, and applying this rule to the a's and the b's points us to 'bbbaa.html'

'28_has_feb' - 28 day, well February also has 29 days - '29_has_feb.html'

'tent_yew_inn' - is an anagram of twenty nine, there are only a couple of anagrams of thirty, the most obvious being 'hit_try.html'

'you win (for now)' finally!, or maybe that's another clue, but I'm done......

ok... that's freaking insane...