Pokémon Red & Blue walkthrough · Part 7 of 12

Part 7: Got the Poké Flute — Pokémon Tower

Mr. Fuji gives you the Poké Flute once you rescue him at the top of Pokémon Tower, where the ghosts need the Silph Scope, found in the Rocket Hideout under the Celadon Game Corner. The flute wakes the Snorlax blocking Routes 12 and 16, which is the way south to Fuchsia.

Got the Poké Flute — Pokémon Tower opens 8 areas. There are 49 trainers standing in them.

Where to go

  1. Route 13

    Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Bellsprout 35% · Lv 22-26 +8 more

    Trainers: Beauty Lv 27, Beauty #2 Lv 29, Biker Lv 28, Bird Keeper Lv 29, Bird Keeper #2 Lv 25, Bird Keeper #3 Lv 26 +4 more

  2. Route 14

    Wild: Bellsprout 35% · Lv 22-26, Oddish 35% · Lv 22-26, Pidgey 20% · Lv 26, Venonat 20% · Lv 24-26 +4 more

    Trainers: Biker Lv 29, Biker #2 Lv 26, Biker #3 Lv 28, Biker #4 Lv 29, Bird Keeper Lv 33, Bird Keeper #2 Lv 29 +4 more

  3. Route 15

    Wild: Bellsprout 35% · Lv 22-26, Oddish 35% · Lv 22-26, Ditto 20% · Lv 26, Venonat 20% · Lv 26-28 +4 more

    Trainers: Beauty Lv 29, Beauty #2 Lv 29, Biker Lv 25, Biker #2 Lv 28, Bird Keeper Lv 26, Bird Keeper #2 Lv 28 +4 more

    Pick up: TM20 Rage

  4. Route 16

    Wild: Spearow 40% · Lv 20-22, Rattata 30% · Lv 18-22, Doduo 25% · Lv 18-22, Raticate 5% · Lv 23-25 +1 more

    Trainers: Biker Lv 29, Biker #2 Lv 33, Biker #3 Lv 26, Cue Ball Lv 28, Cue Ball #2 Lv 29, Cue Ball #3 Lv 33

    Pick up: HM02 Fly

  5. Route 17

    Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Spearow 40% · Lv 20-22 +5 more

    Trainers: Biker Lv 28, Biker #2 Lv 33, Biker #3 Lv 29, Biker #4 Lv 29, Biker #5 Lv 25, Cue Ball Lv 29 +4 more

  6. Route 18

    Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Spearow 40% · Lv 20-22 +6 more

    Trainers: Bird Keeper Lv 29, Bird Keeper #2 Lv 34, Bird Keeper #3 Lv 26

  7. Safari Zone

    Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Dratini 25% · Lv 15 +19 more

    Pick up: TM32 Double Team, TM37 Egg Bomb, TM40 Skull Bash, HM03 Surf

  8. Fuchsia City

    Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Krabby 25% · Lv 15 +1 more

    Pick up: TM06 Toxic

Everything you can have caught by this checkpoint · Open the interactive guide

It also doesn't say when Kanto Underground Path opens up, so it is in no part above; it has its own route page.