local Mod = RegisterMod("Mod", 1)
local game = Game()

function Mod:onPlayerInit(player)
    local player = Isaac.GetPlayer(0)
    local seed = game:GetSeeds():GetPlayerInitSeed()
    local rng = RNG()
    rng:SetSeed(seed, 0)
    local trinket = rng:RandomInt(125)
    player:ToPlayer():AddTrinket(trinket)
end

Mod:AddCallback(ModCallbacks.MC_POST_PLAYER_INIT, Mod.onPlayerInit)