There is always still challenge left, I love games that support a New Game plus feature, let me elaborate:
- The first time you play this game with a fresh new savefile you have to go through normal knowing that you will never touch it again once you unlock PRO mode, a big waste of time if you ask me
- Then you play your first PRO run, this time is different because you will collect absolute every item and peseta for your future playthroughs, quite boring if you ask me since I don't like grinding in games, that's a cheap way to make a game longer that it should be, at the end you will have played 8+ hours until you finished your PRO run...still no fun, at least for me...
- Speed through Ada's short but awesome campaign, from here it begins the fun part, (I love how the overall design for this short campaign is, plus Ada is somewhat faster than Leon). Once you finish an unlock the Chicago Typewriter its all zombie carnage for me, no longer will I have to spent half of my gameplay time in menus or collecting garbage...
- Finally when you have the CT is not god mode, you can refine your skills by trying to achieve the followings:
1) A shorter completion time (currently I have a 2:38 on PRO mode and 0:35 in Ada's campaign)
2) A no death run
3) A good Hit Ratio% so you don't spam the CT too much
Still tired of the CT, then you can try to use the Ultimate item editor to replace the CT with the TMP by giving it 10 Firepower and enabling inf ammo or mod the horrible sound effects of the CT, which is again, very easy
Well maybe that's my idea of fun since I am a speedrunner on the games I play...