Better solution to add previous special goods. Giving a use to them once more. Would make levels ever more expensive. If it had to be locked down with special goods.For me is solution simple. Require Crystallized Hydrocarbons. Then GG for players below SAT. Pay many diamonds or come in to Titan age. This new GBs make players in OP future era much more overboosted. (If have material donat
Lvl11-15
X promethium
Lvl16-20
Prev. lvl's special goods
+
X orichalcium
Lvl21-25
Prev. lvl's special goods
+
X Mars ore
Lvl 26-30
Prev. lvl's special goods
+
X Asteroid ice
Lvl 31-35
Prev. lvl's special goods
+
X Venus Carbon
Lvl 36-40
Prev. lvl's special goods
+
X Unknown dna
Lvl 41+
Prev. lvl's special goods
+
Crystallised hydrocarbon
X promethium
Lvl16-20
Prev. lvl's special goods
+
X orichalcium
Lvl21-25
Prev. lvl's special goods
+
X Mars ore
Lvl 26-30
Prev. lvl's special goods
+
X Asteroid ice
Lvl 31-35
Prev. lvl's special goods
+
X Venus Carbon
Lvl 36-40
Prev. lvl's special goods
+
X Unknown dna
Lvl 41+
Prev. lvl's special goods
+
Crystallised hydrocarbon
Asking for age-lock appears to me envious motives. Envy towards traders and those who can afford it. GbG's attrition is already bypassed by SC/WT. So, some efficient GB's won't do much in younger ages. Let's not forget that space is a hard limit and quite a lot of expansions are from the TT.