You can download Monoko below.
https://steamcommunity.com/workshop/filedetails/?id=3007922797
You can download Sans Boss Fight below.
https://steamcommunity.com/sharedfiles/filedetails/?id=1869814191
You can buy Rivals of Aether below.
https://store.steampowered.com/app/383980/Rivals_of_Aether/
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https://www.youtube.com/watch?v=3nEqik61quw
You can download Noelle Holiday below.
https://steamcommunity.com/workshop/filedetails/?id=2904134945
You can download Boss Buddy below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2229889712
You can download King Bowser below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2037682193
You can download Bowser's Castle below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2509816206
You can buy Rivals of Aether below.
https://store.steampowered.com/app/383980/Rivals_of_Aether/r/
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https://www.youtube.com/watch?v=bAZfJFMkJ_0
You can hear the track below.
https://www.youtube.com/watch?v=fIholqMNNKo
You can buy the album here.
https://www.fangamer.com/products/undertale-determination-cd
You can buy the individual tracks here.
https://determination-ut.bandcamp.com/album/determination
You can buy Undertale below.
https://store.steampowered.com/app/391540/Undertale/
You can buy Beat Hazard 2 below.
https://store.steampowered.com/app/618740/Beat_Hazard_2/
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https://www.youtube.com/watch?v=QIL-tTd1hDQ
You can download Shantae below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2890757258
You can download Amvira below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2108239736
You can download Terraria Devourer of Gods below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2354734852
You can buy Rivals of Aether below.
https://store.steampowered.com/app/383980/Rivals_of_Aether/
...
https://www.youtube.com/watch?v=PkI0L6iCrHc
Despite the thumbnail, this isn't another sequel to Mugen: Ayu Tsukimiya vs Devil Gundam.
You can download Monoko below.
https://steamcommunity.com/workshop/filedetails/?id=3007922797
You can download Tinker Knight below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2261729730
You can buy Rivals of Aether below.
https://store.steampowered.com/app/383980/Rivals_of_Aether/
...
https://www.youtube.com/watch?v=2ulyjsFP2Q4
It's a good sign when you're trying to skip a level before you're even a quarter done with it.
You can buy Celeste below.
https://store.steampowered.com/app/504230/Celeste/
I thought Roxey would be terrible at fighting Dracula but she's actually pretty good at it.
You can download Roxey Aoreolum 2.0 below.
https://steamcommunity.com/sharedfiles/filedetails/?id=3262050795
You can download Dracula 2.0 below.
https://steamcommunity.com/sharedfiles/filedetails/?id=2381606021
You can buy Rivals of Aether below.
https://store.steampowered.com/app/383980
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https://www.youtube.com/watch?v=NsvHgHxOJDk
You can download the campaign below.
https://www.gamemaps.com/details/2526
You can download the version of Jill Valentine I used below as a replacement for Rochelle or Zoey.
Rochelle: https://steamcommunity.com/sharedfiles/filedetails/?id=893645785
Zoey: https://steamcommunity.com/sharedfiles/filedetails/?id=894994382
You can buy Left 4 Dead 2 below.
https://store.steampowered.com/app/550/Left_4_Dead_2/
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https://www.youtube.com/watch?v=9RXec7WKVgU