In Retro Tower Defense, you and your friends summon classic Roblox heroes to hold back a Noob invasion on nostalgic maps like Crossroads and Doomspire. Play through Casual, Normal or Hard difficulties or the endless mode, finishing missions to unlock stronger towers. You can also trade towers with other players and dress them in rare skins.
About this game: written by BloxRadar from the game's description on Roblox.
2,342playing · sampled
—24-hour average vs the same 24 hours last week: not enough data for a fair comparison
Oct 30, 2026last game update on Roblox
92% of Roblox votes are likes
Codes
No code for this game was re-checked in the last 48 hours (last check ).
Not re-checked in 48 h (3)
Still listed as active when we last checked, but that was more than 48 hours ago. They may have expired.
not stated on the official page (allthings.how listed 100 Mo
100 Tix
"Listed as active" means a source we checked lists the code that way. We don't redeem codes, so we can't promise one works — codes can expire without warning.
Players, last 7 days
5K2.5K0
Oct 23, 2026┆ game update Oct 25, 2026, Oct 27, 2026Oct 30, 2026
Over the last 7 days UPD ranged from 854 to 4,563 players (2-hour averages). The first sample in the window was 4,563, the latest 1,877. A game update on Roblox was detected on Oct 25, 2026, Oct 27, 2026 (dashed line).
Daily numbers (table)
UPD players per day
Day (UTC−7)
Average
Peak
Oct 23, 2026
4,051
4,563
Oct 24, 2026
3,163
3,922
Oct 25, 2026
2,191
2,899
Oct 26, 2026
1,496
1,767
Oct 27, 2026
1,422
1,675
Oct 28, 2026
1,267
1,509
Oct 29, 2026
1,224
1,480
Oct 30, 2026
1,497
1,877
Source: BloxRadar samples of public Roblox player counts, about every 30 minutes, averaged per 2 hours.
Busiest: Fridays around 11 AM UTC−7 (about 4,059 players). Quietest: Wednesdays around 10 PM UTC−7 (about 763). On weekdays it peaks around 11 AM UTC−7, on weekends around 7 AM UTC−7. Want full servers and lots of people to trade with? Go at the busy times. Want a quieter game? Try the light squares.
Average players per hour (UTC−7), from our samples over the last 14 days.
UPD update history
Renamed from “AREA 51” to “UPD”
Changed its game description on Roblox
Updated on Roblox 2 times, with update notes
Updated on Roblox
Updated on Roblox
Renamed from “Retro Tower Defense” to “AREA 51”
Changed its game description on Roblox
Updated on Roblox, with update notes
Updated on Roblox
Updated on Roblox
From our own tracking of the game's Roblox page (last 60 days). Update times are when Roblox's "updated" date changed.
What we found
The update is titled 'AREA 51 CAMPAIGN, & HALLOWEEN EVENT' — Update notes on Roblox
Short-term jump: +834% in 2 days (664 6,203 players) — Our player tracking
Events: collect special event currency to collect limited skins & towers — Game page on Roblox
You can now trade towers with other players — Game page on Roblox
An unofficial tracker lists the Halloween Campaign as Oct 23 to Nov 13, with a conflicting 'Nothing is scheduled yet' line — newgame.co.jp
From our video published . Written by BloxRadar from the sources shown.
Common questions about UPD
How many people play UPD?
2,342 people were playing at our latest check (Oct 30, 2026, 11:56 AM UTC−7). Over the last 30 days it averaged 1,771 players. The highest daily peak we've recorded is 6,402 players, on Oct 23, 2026.
Are there any UPD codes?
No codes are listed as active in our latest check (Oct 24, 2026). We re-check the sources regularly and list new codes here.
When was UPD last updated?
Roblox shows its last update on Oct 30, 2026. We saw updates on 6 different days in the last 30 days.
Is UPD OK for kids?
Roblox rates it Mild (9+): it may have mild violence or light fear.
