This card also works nicely with "Demise of the Land". By chaining that to the Special Summon of a monster with a field-clearing effect (such as "Demise, King of Armageddon" or "Judgment Dragon") when your opponent declares priority on the effect's activation, "Geartown" will be brought to the field just in time to be destroyed, giving yourself a free monster that can either hold off an attack or, at the very least, force them to pay the cost to use the destruction effect again.
Pick a copy of this card for the effect of "Magical Hats" to Special Summon at least one "Ancient Gear" monster to your field, excluding "Ancient Gear Beast", "Ancient Gear Golem" and "Ultimate Ancient Gear Golem".
Set "Geartown" to your opponent's side of the field with "Set Rotation". If a player can destroy the opponent's face-down "Geartown(s)", the owner of that card will get to Special Summon an "Ancient Gear" monster, without losing card advantage.
If there are no multiple copies of "Geartown"; "Minefieldriller" or "Z-ONE" can return it to your hand after it is destroyed.
If your opponent uses this card, it will be dangerous destroying it. If there is a need to destroy it, be sure to do it by activating something like "Mystical Space Typhoon" in chain, so the effect of "Geartown" won't activate because it misses the timing (see rulings). Another way is send this card back to the hand with "Giant Trunade" or similar effects, or having something like "Bottomless Trap Hole" or "Torrential Tribute" on the field to destroy the Special Summoned monster after destroying "Geartown". Banishing this card is even better.
Use "Ancient Fairy Dragon" to destroy your own "Geartown", but do not search for a replacement if a monster like "Ancient Gear Gadjiltron Dragon" is need to be Special Summoned, because the timing will be missed for its activation.
"Ancient Fairy Dragon" can easily be Summoned by Normal Summoning "Black Salvo" with a Level 4 DARK Machine like "Mechanicalchaser" or "Toon Cannon Soldier" in your graveyard. Alternatively, "Black Rose Dragon" can be Synchro Summoned to wipe the whole field and get "Ancient Gear Gadjiltron Dragon" when "Geartown" is destroyed.
This card works well with "Earthbound Immortal". When "Geartown" is destroyed, causing the "Earthbound Immortal" to be destroyed, an "Ancient Gear" monster can still be Special Summoned.
Use "Breaker The Magical Warrior" to destroy your "Geartown" and Summon an "Ancient Gear" monster or destroy your opponent's Spell and Trap Cards.
Destroy this card using "Double Cyclone". "Geartown" can be destroyed, and also destroy any harmful Trap like "Bottomless Trap Hole", "Torrential Tribute" or "Mirror Force".
By using 2 copies of this card with "Magical Hats", either 2x Level 2 ("Ancient Gear"), 2 Level 4 ("Ancient Gear Soldier"), 2 Level 5 ("Ancient Gear Engineer"), 2 Level 6 ("Ancient Gear Gadjiltron Chimera") or 2 Level 8 ("Ancient Gear Gadjiltron Dragon") can be Summoned to allow many different Ranks of Xyz Summon.
The effect of "Fire King Avatar Yaksha" can be used when it is destroyed to destroy this card while it is on the field or even in your hand. Then an Ancient Gear monster can be Summoned.
"Chain Dispel" can be activated when this card is activated to destroy two "Geartown" in your Deck, activating their effects.