Geartown

■If "Mystical Space Typhoon" is chained to "Geartown", "Mystical Space Typhoon" resolves first and destroys "Geartown" at Chain Link 2. Then, "Geartown" resolves without effect as Chain Link 1. Since it still resolves, the destruction of "Geartown" is not the last thing to happen, so you miss the timing and cannot activate the effect of "Geartown".[1]
■If "Magic Jammer" is chained to "Geartown", "Magic Jammer" resolves first and negates and destroys "Geartown" as Chain Link 2. Chain Link 1 does not resolve since "Geartown"'s activation was negated. The last thing to resolve is "Magic Jammer", so you can activate the effect of "Geartown" and Special Summon an "Ancient Gear" monster.[1]
■If "Geartown" is Special Summoned by "Magical Hats", "Geartown"'s effect will activate when it is destroyed while being treated as a monster. Its effect will activate if it is destroyed at the end of the Battle Phase by "Magical Hats", if it is destroyed by battle, etc.[2]
■When "Geartown" or "Morphtronic Map" is activated from the hand, the effect of "Royal Oppression" cannot be activated.[3]
■The effects "destroy a Field Spell Card" and "gain 1000 Life Points" of "Ancient Fairy Dragon" are considered to resolve simultaneously. However, if you choose to resolve the "add 1 Field Spell Card to your hand" effect, then that occurs afterwards.[4]
■Example: If "Geartown" is destroyed by the effect of "Ancient Fairy Dragon" and you choose not to add a Field Spell Card to your hand, then you can activate the effect of "Geartown". However, if you add a Field Spell Card to your hand, then you miss the timing and cannot activate the effect of "Geartown".[4]
■The effect of "Geartown" is optional, so if the last thing to resolve is not the destruction of "Geartown", then you cannot activate the effect of "Geartown" which Special Summons the "Ancient Gear" monster. If something resolves after "Geartown" is destroyed, then you miss the timing and cannot activate the effect.[5]
■If your "Geartown" is destroyed because your opponent activated a Field Spell Card, then the last thing to resolve is the destruction of "Geartown". Thus, you can activate its effect and Special Summon an "Ancient Gear" monster.[5]
■If your "Geartown" is destroyed because you activated a new Field Spell Card, then after "Geartown" is destroyed you resolve the effect of the new Field Spell Card. Thus, you miss the timing and cannot the effect which Special Summons an "Ancient Gear" monster.[5]
■If your "Geartown" is destroyed because you Set a new Field Spell Card face-down, then the last thing to resolve is "Geartown" being destroyed. Thus, you can activate its effect and Special Summon an "Ancient Gear" monster.[5]