If you want to speed clear through the missions, it is better to start saving up a lot of keys since they will be often used. You can also trade keys from the card trader.
If I already sold my cards, how can I clear the missions at stage 48?
Duel against the lvl 30/40 legendary duelist with a high duel assessment until it drops. Refer to this deck to get a high score: http://duellinks.gamea.co/c/ncr48azf or the specific decks against lvl 40 legendary duelists on the left side of the page.
Stage 41-50 missions/rewards
Stage #
Unlocked Facility/Feature
Mission
Reward
41
None.
Successfully perform 2 Fusion Summons in one Duel.
R Jewel x3
Win 15 Duels against the Legend Duelists.
Gem x15
Win 55 Duel World Duel(s).
Gate Key x60
Play 1 Duel against Odion.
Red Gate Key x20
Complete all Stage Missions[41].
Gem x50
42
A player obtains Card Sleeves.
Use Trap Cards 5 times in one Duel against Jowy Wheeler.
Gem x10
Win with a Duel Assessment of at least 4000 against Yami Yugi.
Black Gate Key x30
Win one Duel against Joey Wheeler at Level 30 with using Odion.
Card Sleeves
Win 58 Duel World Duel(s).
Gate Key x60
Complete all Stage Missions[42].
Gem x50
43
None.
Successfully perform 20 Ritual Summons.
Stone of Darkness x4
Successfully summon 5 monsters in one Duel with using Bandit Keith.
Stone of Earth x2
Inflict 240000 points of battle damage.
SR Jewel x1
Win with a Duel Assessment of at least 4000 with using Seto Kaiba.
White Gate Key x30
Complete all Stage Missions[43].
Gem x50
44
A player obtains a playmat.
Win a duel against the Legend Duelists 20 times.
White Gate Key x30
Win with a Duel Assessment of at least 4500.
Gate Key x100
Win a Duel against Rex Raptor at Level 40 with using Mai Valentine.
Card Sleeves
Win 63 Duel World Duel(s).
Black Gate Key x30
Complete all Stage Missions[44].
Gem x50
45
Up to 10 standard duelists appear at once (Standard Duelists become Level 45).
Successfully perform 40 Tribute Summon(s).
Stone of Wind x6
Use Spell Cards 50 times .
Stone of Spell x4
Win a Duel against Seto Kaiba at Level 40 with using Joey Wheeler.
Card Sleeves
Win a Duel against Yami Yugi at Level 40 with using Tea Gardner.
Card sleeves
Win 66 Duel World Duel(s).
SR Jewel x1
Complete all Stage Missions[45].
Gem x150
46
None.
Use Spell/Trap card 40 times with using Ishizu Ishtar
Stone of Earth x4
Successfully perform 20 Fusion Summons.
R Jewel x1
Use Trap card 50 times.
Stone of Trap x2
Destroy 100 monsters.
20000 Gold
Inflict 280000 points of battle damage.
Gate Key x70
Complete all Stage Missions[46].
Gem x50
47
A player obtains a playmat (BEWD & Dark Magician).
Win 30 Duels against the Legend Duelists.
Gate Key x100
Use Spell/Trap card 60 times.
SR Jewel x1
Successfully perform summon 100 monsters.
Gem x50
Win 73 Duel World Duel(s).
Gate Key x80
Complete all Stage Missions[47].
Gem x50
48
None.
Normal Summon Dark Magician Girl 3 times.
Blue Gate Key x40
Normal Summon The Legendary Fisherman 3 times.
Green Gate Key x40
Normal Summon Barrel Dragon 3 times.
Red Gate Key x40
Normal Summon Blue-Eyes White Dragon 3 times.
White Gate Key x40
Normal Summon Dark Magician 3 times.
Black Gate Key x40
Use Blast Held by a Tribute 3 times.
Yellow Gate Key x 40
Win with a Duel Assessment of at least 5000.
SR Jewel x1
Win 77 Duel World Duel(s).
Gate Key x100
Complete all Stage Missions[48].
Gem x50
49
None.
Inflict 320000 points of battle damage.
UR Jewel x1
Win 1 Duel against Bandit Keith at Level 40 in Duel World.
Gem x10
Win 1 Duel against Mako Tsunami at Level 40 in Duel World.
Gem x10
Win 1 Duel against Ishizu Ishatar at Level 40 in Duel World.
Gem x10
Win 1 Duel against Odion at Level 40 in Duel World.
Gem x10
Win 1 Duel against Weevil Underwood at Level 40 in Duel World.
Gem x10
Win 1 Duel against Rex Raptor at Level 40 in Duel World.
Gem x10
Win 1 Duel against Seto Kaiba at Level 40 in Duel World.
Gem x10
Win 1 Duel against Yami Yugi (or Seto Kaiba) at Level 40 in Duel World.
Gem x10
Win 1 Duel against Joey Wheeler at Level 40 in Duel World.
Gem x10
Win 1 Duel against Tea Gardner at Level 40 in Duel World.
Gem x10
Win 1 Duel against Mai Valentine at Level 40 in Duel World.
Gem x10
Complete all Stage Missions[49].
Gem x200
50
A player obtaines a playmat (Yami Yugi & Seto kaiba) and an icon (Kuriboh).
Successfully perform 30 Fusion Summon(s) in Duel World mode.
SR Jewel x1
Inflict 4000 points of battle damage with a single attack.
Gate Key x80
Summon Dragon-Type Monster(s) 50 time(s) in total.
White Gate Key x40
Summon Spellcaster-Type Monster(s) 50 time(s) in total
Black Gate Key x40
Use a Spell Card 6 time(s) in one Duel World Duel.
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