This is largely about the Madhouse, however, it applies to Buy Maplestory 2 Mesos too many events in Maple, that have a part of RNG and limited efforts. Thus, also things like the Dark Lords of Darkness, Hunter's Club, SAO (although that you had a paid component), etc. An event needs to have a means to make sure everybody wins, provided they strive hard enough.
Examples for your Madhouse event: Allow going back in if reaching the Escape space, without consuming another pass. It's still possible not to find a particular page, even when allowed to roam the Madhouse eternally, but it gets vanishingly unlikely. Make it possible to buy any diary page you are missing by paying some (big) amount of coins.
Make the opportunity for getting a page out of the proper reactor go up with the number of attempts that you make, until it reaches 100% or until you get the page. So, if the prospect of a Test Tube dropping Page 2 starts out in 5 percent, then each time you activate a Test Tube it will go up by another 5%, until after 20 Test Tubes you are assured of getting that page. When you get the webpage the opportunity resets to 5 percent and stays there.
I'm certain other methods can be considered. The important part is, again : be sure everyone who makes a sincere effort can finish the occasion. But making us work hard and then fail due to random chance, is bothersome, enraging, and unfair. Real Life does that, but we play games to escape the temptations of actual life, to not acquire more of them.
After a couple frustrating efforts in the train and beating Shao MS2 Mesos , I have come up with a way to kill her for Zero which should lead to no death (it did for me, twice in a row,) plus a couple(somewhat obvious, but still potentially helpful)tips for escaping the train. Most of this depends on the ability "Time Holding" so in case you're too low to have that ability, this might not be as helpful, but you still might find a few hints.